What makes a glow worm glow?

A light meal!

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How many people from Chernobyl does it take to screw in a lightbulb?

None. They glow in the dark.

What do you call a balloon that glows in the dark?

A Led Zeppelin

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What makes a glow worm glow?

A light meal!

Why was the glow worm unhappy?

Because her children weren't that bright!