2 Explosions

 A physician had the fun and great idea of mixing liquid nitrogen with 1500 ping pong balls in a trash can. This science teacher made this experiment to demonstrate the fact that when nitrogen changes to gas, it needs space, but since it was in a trash can, covered in ping pong balls, it pushed the balls away so hard that they all jumb a few meters highti.
This teacher had also beaten the record for the most fireworks at a time. Before his invention the record was with 17 439 rockets now he made 56645 rockets go up at the same time with 2150 kg of canon pouder!!!!! Here is his video.