Simple application of Pressure imbalance

Mostly everyone has seen or been to a magic show at least once during the natural course of lifetimes.
I have also been to few  when I was kid.
The magic trick showed then was ' the magician filled a bottle of water with small holes in the cap
for the water to drain out. he then called me on to the stage asked me to look at the bottles and to tell the audience if the holes were authentic or if they were sealed with some transparent glue.
After conformation he gave me the bottle and asked me to turn it upside down and well obviously
water fell out thanks to gravity.
He then took to the bottle in his hands, whispered a few chants, gave the bottle a few shakes and walla
the drizzling water stopped as though gravity wasn't working.'
The trick ended and i have been thinking about it for a quite some time and finally
it dawned
it wasn't the absence of gravity but the mere pressure of air and water which was stopping the water from falling out.
The mumbo-jumbo was just for the amazement of the audience the real trick was in the shakes and wobbles he squeezed the plastic bottle while shaking
And as we very well know squeezing causing pressure and the pressure was sufficient to create an imbalance between air inside and outside the bottle.
Thus stopping the flow of water from the bottle.
Knowing is way more fun then the trick itself.....