Office chair game

Whenever I'm sitting on an office chair, especially when I'm in a class, I love to gently pull the lever underneath it that makes the chair go down. I like to try and pull it as far as I can without my seat suddenly falling. I get a real adrenaline rush from it, since if I pull it too far, I can get quite embarrassed. Is it normal?

Does anyone else do this? It's really exciting.