Four worms were placed in four separate test tubes:
1st in beer
2nd in wine
3rd in whiskey
4th in mineral water

The next day, the teacher shows the result
The 1st worm in beer, dead.
The 2nd in wine, dead.
The 3rd in whiskey, dead.
The 4th in mineral water, alive and healthy.

The teacher asks the class: What do we learn from this experience?
And a child responds: Whoever drinks beer, wine and whiskey, does not have worms.