Person A & B are both drunk, just come in from the pub. A hands their camera to B so that B will take a photograph of them.
A is standing and B is sitting as the exchange is made. Somehow in the drunken exchange the camera falls to the ground & breaks. A is very annoyed & blames B for it. The next day B goes out & buys a replacement because they feel bad but also feels that it wasn’t strictly their fault.
Who’s fault was it?