I admit to having had the occasional bout of uncontrollable laughter while watching the show Jackass and the first of the movies. Some of the stuff is quite creative, most is unwise, and all of it carries a fairly substantial risk of injury.
Sticking a knife in the ceiling and tying to catch it in your mouth when it falls certainly meets the latter 2 criteria. It is not creative, but is definitely unwise and dangerous.
There is a video at this link from DailyMailUK. It isn’t on YouTube that I could find, so I can embed it. But if you want to watch Steve-O’s latest lesson in gravity, click here.