You need:

• An empty bottle
• A piece of paper
• Or: two eggcups and an uncooked egg

Lay the bottle in horizontal position in front of you. Put the piece of paper in the neck of the bottle. Try to blow the piece of paper into the bottle. What happens?

You ‘ll see that if one blows hard enough, the piece of paper doesn’t fly into the bottle. How does this happen?

It’s not happening because the bottle is not empty: it is filled with air. While blowing in the bottle more air is added. So if you blow the piece of paper the air becomes compressed, which leads to increasing air pressure. If the pressure becomes to big, the piece of paper will fly out of the bottle.

The Easter alternative for this experiment is to blow an egg from eggcup to eggcup.
The egg “jumps” from one eggcup to the other.