I have met many veterans of Bomber Command, some say that when the "toilet", (basically a tin bucket with a lid) was used especially for a number 2, they would simply empty it out over Germany.
A similar story was one guy's girlfriend made him a cake to take back for his crew. They took it on a mission and the first bloke had a piece, YUK, there was something wrong with it.
So they put it back in the tin and threw that out the window as well. If it didnt hit somebody in the head and kill them outright they thought it would later if someone ate it!