
Here's a short video of kids throwing a large salad bowl of liquid nitrogen into a small hotel swimming pool — it's a gorgeous fog effect, and all the cooler for happening in a totally normal hotel.
(Thanks, Fipi Lele!)
Update: How cool! This turns out to be a stunt from the last PenguiCon, an awesome Linux/science fiction convention that I was Guest of Honor at a couple years back. Thanks to everyone who wrote in about this!