The 'Reserved' sign is the only one I'd object to. It's likely to be read from afar, and never approached close enough to get the joke. Even then, it would be easy to reason that 'fun and games' was an in-joke from whichever party made the reservation.
True but only if it's the first sign you come across. If I'd read any of the other signs beforehand I'd have laughed and made a special effort to inspect the 'reserved' sign.
