It's one thing to repeatedly slip across the Mexico-USA border. Dangerous, but in wide-open spaces. It's quite another to stowaway five times across the Atlantic on a confined ship. (Of course, stowing away in a jetliner's wheel well is another matter entirely.)
Back in 1932, 14-year-old Charles Highfield was promoted by his father as being the strongest boy in Great Britain. In the first picture, that's the father standing on his son's neck. The Coventry Telegraph has a bit more info about Charles's brief career as a strongman.