I think every person should have one joke that they can pull out of their pocket when they need to cheer someone up.  This one is my favorite because it can easily be cleaned up a bit and told to a small person.  Poop humor is always good.

A bear and a bunny are in the woods taking a shit.  The bear turns to the bunny and asks, “do you have trouble with shit sticking to your fur?”  The bunny replies, “why, no.”  So the bear picks up the bunny and wipes his ass with him.