Sat on the tube today there was a lady with an ice cream tub full off soup sat next to me. She'd quickly take spoonfuls every time the train decelerated and while it waited at the station. I do appreciate that as I reckon I would have ended up with a lap full of soup if she had been eating it while the train went full speed.
For some reason soup seems to fall into the unacceptable train food category. Are there other foods which people deem unacceptable in certain situations?