In a school science class four worms were placed into four separate jars.

The first worm was put into a jar of alcohol.
The second worm was put into a jar of cigarette smoke.
The third worm was put into a jar of sperm.
The fourth worm was put into a jar of soil.

After one day, these were the results:

The first worm in alcohol --- dead.

The second worm in cigarette smoke --- dead.

The third worm in sperm --- dead.

The fourth worm in soil --- alive.

So the science teacher asked the class --- "What can you learn from this experiment."
Little Johnny quickly raised his hand and said. "As long as you drink, smoke and have sex, you won't have worms."