Before classrooms were littered with iPads and other fancy electronics, teachers resorted to old-fashioned indoor classroom games that wasted a lot of time.Anything was better than studying or completing worksheets, so we went along with it, but not all these games were as hype as teachers tried to make them. That being said, not all were that bad either. University HospitalsLet's be real though, the ones that were more competitive were the most fun. Here are 10 indoor games that will open the floodgates to some of your favorite, and maybe most-hated, childhood memories. Seven Up (Heads down, thumbs