A fourth grade class was asked to provide original endings to famous sayings.
This is what they came up with:

The grass is always greener when you leave the sprinkler on.

A rolling stone plays guitar.

A bird in the hand is a real mess.

It's better to light one candle than to waste electricity.

It's always darkest just before I open my eyes.

You have nothing to fear but homework.

If you can't stand the heat, don't start the fireplace.

If you can't stand the heat, go swimming.

Never put off for tomorrow what you should have done yesterday.

A penny saved is nothing in the real world.

The squeaking wheel gets annoying.

To err is human. To eat a muskrat is not.

I think, therefore I get a headache.

Laugh, and the world laughs with you. Cry, and someone yells "Shut up!"

Better to light a single candle than to light an explosive.

Early to bed and early to rise is the first in the bathroom.

A journey of a thousand miles begins with a blister.