A few:
quite desperate after a few beers, glad to find the toilet is in service, but... oh, there’s a big pool of pee in the toilet. Did the last person not flush? Press the button, and the flush squirts a bit more water into the bowl, but doesn’t suck any out. Ok, so the tank’s full. Sounds like a good time to do what I used to do as a student - piss in the sink! Which also doesn’t drain, so now there are pools of pee in the toilet and also the sink...
the older style of European train: when you flush, you seen the track rushing by under you.
virgin trains now have a recorded m