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Egg in a Bottle Science Experiment

Materials

Hard boiled egg without shell (large/ Xlarge eggs are best)
Glass bottle with an opening slightly smaller than the egg
Matches
Small piece of paper

Directions

Put the small piece of paper into the bottle

Light a match and drop into the bottle along with the paper

Immediately place the egg on top of the bottle, so that the opening is completely closed.

Watch the egg drop into the bottle!

To get the egg out of the bottle, hold the bottle upside down so that the egg blocks the bottle opening. Blow as hard as you can into the bottle. The air pressure in the bottle forces the egg out and into your hand.

What's Going On?

The egg prevents outside air (high pressure) from getting into the bottle while the flame causes the air inside the bottle (low pressure) to contract causing a small vacuum.
As the outer air pushes its way into the bottle and the vacuum is created in the bottle, the egg falls in.