Human Bingo: A people-watching game

It's bingo, but for noticing all the diverse and delightful people that pass you by on an ordinary day. Go somewhere with a lot of foot traffic (like a mall), then generate a bingo card with squares like "Eating on the go," "Mismatched socks," or "College athlete." Mark each square when you see someone that matches it. Mark an entire row, column, or diagonal to win, or keep playing and mark every square to get blackout! Play by yourself or with unlimited friends, no Internet connection required. It's a fun way to pass the time at an airport, mall, convention, or parking lot.