I hate to get all picky physicist, but ice-nine (Ice IX) does exist in real life. It's a crystal structure of ice that only exists within a specific range of pressure and temperature and lacks the destructive properties of ice-nine in Cat's Cradle.

http://en.wikipedia.org/wiki/Ice_IX

Physics karaoke.

I was at the biggest physics meeting in the country and I noticed in the program that there was a night event called "Physics Sing-along". I was at the grad student reception before it and met someone else interested in singing physics songs. He actually had his guitar and had written a couple songs that week. We decided to perform them together. So we went to a drug store, bought poster board, and made cue cards so everyone could join in. Then we went to the sing along and sang our hearts out. One song was about finding true love at a physics conference and the other was about random physics terminology from the abstract booklet.

Here's a pic.
http://imgur.com/p0RSG