What makes a glow worm glow?

A light meal!

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How do we get in?

Obi-Wan: We'll be stealthy. *turns on huge, glowing laser sword*

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

None. They glow in the dark.

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What do you get if you cross a glow worm with some beer?

Light ale!

What makes a glow worm glow?

A light meal!