My desk chair began to slowly depressurize, like a tire with a slow leak. After a while, I felt like I was almost sitting on the floor, so I ordered a new chair for my computer room. It's a "gaming" chair. I can't wait to find out how fast I can finish a mahjongg game once that chair arrives. It should be easy to beat my best times in that chair!
EDIT: I checked, and a seatbelt isn't standard.