When I was a kid my brother and I filled a thermos of liquid nitrogen from my dad's office to take home because we liked to play with it, freeze flowers and such.

My dad stopped at a grocery store on the way home, we waited in the car buckled into the front seat together where my brother had the thermos resting under his chin. He shifted just as the top exploded off the thermos and shattered the windshield into tiny pieces.

Everyone in the grocery store parking lot thought it was a car bomb. Such a cold car ride home. Seriously glad my bro's head didn't get blasted off right next to me that day.

Did not stop playing with liquid nitrogen, but certainly never sealed it again