Dumping a bucket of cold water on your head is complicated. Actually, it's not but it is if you're these people, who some how manage to turn this simple task into complete failure.
Sometimes it's their own stupidity that damns them, other times it's through other people interfering. Either way it's always hilarious, because you can't really beat a bit of guy-gets-hit-in-groin style humor.
And once you're done watching the people in the video, here's a few more instances of people completely failing the ice bucket challenge.
And here's a girl doing it after having her wisdom teeth removed, which probably wasn't the best idea.