On each urinal in the ferry crossing the Arsh Sea is the following sign:
To operate the flush system press button then release
At first glance, it's this ridiculous operating of the flush system that catches my eye. Does your toilet have a flush system? Do you operate it? But then I realise that, pointlessly sci-fi though that may be, it's "then release" that's the really stupid bit. Perhaps, before they installed these signs, people didn't.