As terrible as it is to admit, the best part about unscripted television is the very real possibility of someone messing up horribly, or something going wrong.
It's why live events are so exciting, aren't they? Will people fudge it royally, and if they do, will they be able to keep it together? Heck, Jimmy Fallon pretty much made a career off of it on Saturday Night Live, because there was nothing better than watching him enthusiastically soldier on after breaking character.
The same kind of "OMG what could go wrong" logic applies to gameshow fails. Whether it's someone missing an obvious answer, or accidentally NSFW moments, you can always count on a good gameshow fail for a solid laugh, even if they aren't live.