Snowball Fight...kids write 3 things about themselves on a sheet of white paper. They do not write their names on the paper. Wad it up and on your command, have a "snowball" (or baseball) fight. At the end of 1 minute, each student grabs the nearest snowball and tries to guess who wrote it. Would be great at the beginning of the year!
Holy cow, 271 pages of Post-it activities for teachers. This might be a pin now, read later. This is a cheap, easy way to get students up and moving while still learning and it gets them thinking of different types of questions to ask.