Dani was trying to to teach his son the evils of alcohol.
He put a worm in a glass of water & another in a glass of
whiskey.
The worm in the water lived while the one in the whiskey
curled up & died.
"All right, son," Said Dani, "what does that show you?"
"Well dad, it shows that if you drink alcohol you will not
have worms.
Very negative effect.