According to wikipedia, there are only four full-length films shot entirely in Esperanto. One of these four is the 1966 black-and-white horror film Incubus, starring William Shatner.
The film had an LA premiere, but then, partly because of the Esperanto dialogue, it never found a distributor except in France and fell into obscurity. For years it was believed that all copies of the film had disappeared, until the 1990s when a copy was found in France.
Back in 1978, Lidia Mostovy was chosen to deliver the valedictory address at the 99th commencement of Frank H. Morrell High School, so she decided to give it in Latin. Her speech began: "Olim Alexander Magnus dixit: 'Meis parentibus vitam debeo, meis magistris, vitam bonam.'"
She explained that she "wanted to add dignity to the graduation exercises and... draw attention to the high school's Latin program. 'A lot of people ask why take Latin — you're not going to use it. So now I will.'"
Since I took Latin throughout high school, and even participated in our high school's Latin play, I'm sympathetic to what she did. And I guess it probably wasn't any more or less boring than any other high school valediction, just because no one could understand it.