Communication Failure :-)

One day, a teacher decided that a visual demonstration in the class would add emphasis to the teaching and placed four worms into four separate jars.

The first worm was put into a container of alcohol, the second worm was put into a container of cigarette smoke, the third worm was put into a container of chocolate syrup and the fourth worm was put into a container of clean soil. Then the teacher continued teaching...

At the end of the class, the teacher said:

The first worm in alcohol - Dead. 

The second worm in cigarette smoke - Dead

Third worm in chocolate syrup - Dead

Fourth worm in clean soil - Alive.

Then the teacher asked the class - Dear students, what did you learn from this demonstration?

A little girl sitting at the back quickly raised her hand and said, "As long as you drink, smoke and eat chocolate, you won't have worms!"