New google easter eggs (December)

I accedently found something on google when I started to sype in "Do contract phones expire if you leave them?" I only got to the do when it changed my text to "do a barrel roll". Before I hit enter my screen was spinning like mad. I thought that something had gone wrong. I started to experiment with commands. The only one I have found so far is "Let it snow". I will let you find out what it does. Also try typing "tilt" and hitting enter.