[BookmanTheJanitor]

A squirrel is relaxing in his tree when it suddenly starts to shake violently. He looks outside and sees an elephant climbing the tree.

The squirrel says "hey elephant, what are you doing?"

The elephant replies "I'm climbing this tree to eat some pears!"

"You dummy," sayeth the squirrel, "this is a pine tree... there's no pears up here."

The elephant says "I know, I brought my own!"

[Sarcasm Factory]

That bit sounds like a great joke to tell the kids, complete with silly sound effects like triumphant elephant trumpeting and squirrelly squeaking and the crashing and booming as the whole tree falls down. ^_^