A bunch of ellipses, a cylinder, and some lines are hanging around together talking:
The ellipses, “Hey, we’re leaves!”
The long cylinder, “And I’m a trunk.”
The lines, “I guess we’re branches.”
They arrange themselves accordingly. Euclid comes along, sits down next to the shapes, and asks what they are.
The shapes respond, “Gee, I’m a tree!”
MORE WAYS TO LAUGH