I have an amazing relationship with my wife, but sometimes there are arguments. It happens.
Sometimes it's a character you want to play or a story you want to tell. Sometimes it's just to pay the bills.
I have an elbow that bends the wrong way, and I'd do things like stand in an elevator and the doors would close, and I'd pretend that my arm had got caught in it, and then I'd scream, 'Ow, ow, put it back!'