Sometimes, the most confusing things can also be the most amusing.
“The floor of a bathroom stall in a nice restaurant.”
“This is a bathroom at my school. This is a square room with 2 urinals next to each other. You can even close the door, but why?”
“Tray on an Irish train. If the recess for the cup had been anywhere else, then the wheel wouldn’t block the cup. The cup holder is too small.”