Anyone For Coffee

A teacher wanted to demonstrate to his students the damaging effects of caffeine.

He took 2 worms, placed one in a cup of water and the other in a cup of coffee.

The worm in the water was fine. The other worm upon sinking in the coffee promptly died and dissolved.

'Now' the teacher asked 'What does that prove to you?'

A cheeky student retorted 'If you drink coffee you won't have worms!'