I have a pretty simple rule. If some event is supposed to be funny just because the victim miraculously escaped serious injury, then it's NOT funny.
Alas, my generalization to sitcoms/kid shows/etc that something that wouldn't be funny "in real life" shouldn't be funny on TV either, seems to be an unpopular attitude. "hah hah, he answered the question wrong so they dumped a bucket of slime on him! That's soooo funny!" (WTF?)