Worms
A seventh grade Biology teacher arranged a demonstration for his class.

He took two earth worms and in front of the class he did the following.

He dropped the first worm into a beaker of water where it dropped to the bottom and wriggled about.

He dropped the second worm into a beaker of Ethyl alcohol and it immediately shrivelled up and died.

He asked the class if anyone knew what this demonstration was intended to show them.

A boy in the second row immediately shot his arm up and, when called on said: Youre showing us that if you drink alcohol, you wont have worms.