Eat a large meal.
Sit in any way other than perfectly straight at the edge of a chair.
Stand up gracefully after sitting down.
Suck in your stomach to walk through a tight crowd.
Hunch over a table to string beads.
Put on or take off shoes. Socks, ditto. Pants are possible but difficult.
Bend over to pick up or put down anything.
Sleep (just a guess, but I feel pretty certain of it).
(Can you tell I spent a couple of hours in my wedding corset yesterday afternoon?)