Get Personal With Me: Humor

Humor is a funny thing.  Different things cause different people to laugh.  The mere mention of a certain word may result in one person breaking out into a huge belly laugh because it reminds them of their favorite joke.  For another person, the absurdity of their current situation may cause them to break down in peels of hysterical laughter.

How about you?  What's something that tickles your funny bone to the point you can't hold in the laughter?