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> PS: Old old joke - one caterpillar to another caterpillar "You know, the thing that worries me is, you never see any old caterpillars".

Another caterpillar joke:
Two caterpillars were sitting on the ground when a butterfly soars overhead. One caterpillar turns to the other and says, "They'll never get me up in one of those things."

Ok, one more:
A small boy looks at a caterpillar and says, "I wonder how they get those big diesel engines in something so small."

And they don't get any worse than that.