In 1731, a lion was given as a gift to King Frederick I of Sweden. When it died it was sent to a taxidermist for preservation. Unfortunately, the taxidermist wasn't sure what a lion was supposed to look like, and this was the result:
More info:
Design You Trust
AKA "Le chapeau paratonnerre."
Details from Amelia Soth on JStor Daily:
According to the popular science writer Louis Figueir, all the excitement about the new knowledge of electricity led to an odd trend: in his recounting, Paris in the 1770s saw a fad for ladies’ lightning-rod caps, trimmed with metallic thread connecting to a cord that dragged along the ground. The (extremely flawed) theory was that the cord would carry a lightning bolt harmlessly away from the wearer. He also writes of a lightning-rod umbrella proposed by one of Ben Franklin’s acolytes, Jacques Barbeu-Dubourg. The umbrella would be surmounted with a metal pole and trail a silver braid to bear away the charge.

image source: wikimedia
A more recent version of a lightning-rod hat:

Tampa Bay Times - Aug 16, 1975
Margaret Thompson of London was buried on April 2, 1776. Her will directed that her casket should be filled with snuff, and that snuff should be liberally handed out to the crowd at her funeral.
I Margaret Thompson, &c. being of sound mind, &c. do desire, that when my soul is departed from this world, my body and effects may be disposed of in a manner following, &c. &c.—
I also desire that all my handkerchiefs that I may leave unwashed at the time of my disease, after they have been got together by my old and trust servant, Sarah Stuart, be put by her alone, at the bottom of my coffin, which I desire may be large enough for that purpose, together with such a quantity of the best Scotch snuff (in which she knoweth I always had the greatest delight) as will cover my deceased body — and this I desire more especially, as it is usual to put flowers into the coffin of departed friends, and nothing can be so fragrant and refreshing to me as that precious power.
But I strictly charge that no man be suffered to approach my body till the coffin is closed, and it is necessary to carry me to my burial, which I order in the manner following:
Six men to be my bearers, who are well known to be the greatest snuff takers in the parish of St. James', Westminster—and instead of mourning, each to wear a snuff coloured beaver, which I desire may be bought for that purpose, and given them.
Six maidens of my old acquaintance, viz. &c. to bear my pall, each to wear a proper hood, and to carry a box filled with the best Scotch snuff, to take for their refreshment as they go along. Before my corpse I desire the minister may be invited to walk, and to take a desirable quantity of the said snuff, not exceeding one pound; to whom I bequeath two guineas on condition of so doing. And I also desire my old and faithful servant, Sarah Stuart, to walk before the corpse, to distribute every twenty yards, a large handful of Scotch snuff to the ground, and upon the crowd who may possibly follow me to the burial place—on which condition I bequeath her £20. And I also desire, that at least two bushels of said snuff may be distributed at the door of my house in Boyle street.
Source:
Euterpeiad, or, Musical Intelligencer & Ladies' Gazette - June 28, 1821

Source: Crazy - But True!, by Jonathan Clements
According to what may be legend, King Gustav III of Sweden conducted that country's first clinical trial during the second half of the 18th century. He wanted to determine whether drinking coffee was bad for one's health. He firmly believed it was.
The story is told on the website of Sweden's Uppsala University Library:
The king Gustav III viewed coffee consumption as a threat to the public health and was determined to prove its negative effects. It is said that he decided to carry out an experiment on two prisoners. Two twins had been tried for the crimes they had committed and condemned to death. Their sentences were commuted to life imprisonment on the condition that one of the twins drank three pots of coffee every day while the other drank the same amount of tea, and this for the rest of their lives, in order to see if the coffee affected their life expectancy. Unfortunately the king died before the final result of his experiment: the first twin died at the age of 83 and he was the one who drank tea!

Barstow Desert Dispatch - Jan 7, 1991
Wikipedia notes that the authenticity of the coffee experiment story has been questioned. Though it doesn't say why.
As far as I can tell, the earliest English-language reference to the story appeared in a 1937 issue of
The Science News-Letter. This account was then widely reprinted in newspapers (see below).
The Science News-Letter attributed the information to the Swedish-born botanist Bror Eric Dahlgren, who was a curator at the Field Museum in Chicago. Dahlgren did author a 1938 pamphlet about the history of coffee,
which you can read online at the Biodiversity Heritage Library, but it doesn't include the story of King Gustav. I can't locate where else Dahlgren might have told the story of the coffee experiment, which makes it impossible to check his references.

The Sheboygan Press - May 28, 1938
The modern-day Vietnamese man named Tran Van Hay reputedly had hair "over 22 feet long."
Other modern record-holders are in the 18-ft range.
But they can't hold a patch to Chief Long Hair of the Crows.
Itchuuwaaóoshbishish/Red Plume (Feather) At The Temple (born ca. 1750, died in 1836) A Mountain Crow leader during fur trade days and signer of the 1825 Friendship Treaty. Traders and trappers called him Long Hair because of his extraordinarily long hair, approximately 25 feet long. At his death, his hair was cut off and maintained by Tribal leaders.
Now because Long Hair lived before photography, there is no visual record of this. However! Supposedly his tresses are part of the exhibit at
Chief Plenty Coups State Park in Montana. (Plenty Coups was a descendant of Long Hair.)
Source of quote.
If any WU-vie is passing by the museum, perhaps he or she can confirm!
Here's a photo of another Crow tribe-member named "Curley."
Lots of bizarre stuff
from this creator, seen
at this page, and
also here.
And if you're in New York City over the next couple of months,
you can visit an exhibit.
Circa 1793, a Mr. Powyss of Lancashire apparently decided to conduct an unusual psychological experiment by paying a man to live in his basement, in complete solitude, for seven years.
Information about this experiment is hard to find. A brief news item appeared about it in 1797:

The Annual Register... for the year 1797
A news story 30 years later reported that the subject of the experiment had emerged after seven years apparently no worse for wear. Or, at least, he had "absolutely accomplished it":

The Casket - Aug 11, 1827
Given the lack of info, I suspect that the entire story might be an urban legend — one of those fake news stories that often made their way into early magazines and newspapers. However, the story has inspired author Alix Nathan to use fiction to fill in the blanks... imagining what might have happened in her recent novel
The Warlow Experiment.
As reported by the Guardian:
Nathan tried to discover more about Powyss and the outcome of his experiment, but without success. Nothing of either remained. Instead she turned to fiction, writing a pair of short stories that imagined the peculiar undertaking, the first from Powyss’s point of view, “An Experiment: Above”, and then, in “An Experiment: Below”, from the solitary subterranean perspective of his confined subject... Despite this, Powyss and his story continued to nag at Nathan; she could not shake the sense that it “deserved fuller consideration”. The result is
The Warlow Experiment [
amazon link].