Four worms were placed into four separate jars. ...

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: The first worm-dead. Second worm-dead. Third worm-dead. Fourth worm-alive.

Lesson: As long as you drink, smoke and have sex, you won't get worms!

Source: http://jokes4all.net