Take a transparent container filled with water. Make a small boat out of aluminum foil, paper and a toothpick put it on the surface of the water take a transparent plastic cup and it over the boat and give it a gentle push down.
when the plastic cup is pushed down the surface of the water, the bot goes down. The boat remains on the surface of the remains on the surface of the trapped water in the plastic of force caused by trapped air.
when the plastic cup is pushed down the surface of the water, the bot goes down. The boat remains on the surface of the remains on the surface of the trapped water in the plastic of force caused by trapped air. 
Nice
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