Google has hidden a special holiday "Easter Egg" that turns your screen into a winter wonderland.
Simply search for "let it snow" on Google and prepare yourself for an HTML5 blizzard--actually, it's more like a few flurries. The cool part comes after a few seconds, when your screen "frosts over" and your cursor can be used to trace messages or doodles like a finger against a window on a chilly day.
Press the Defrost button to remove the snow.
Hat tip: TrendingRight.