A sturdy oak door to the farm shop tea room.
So there's a clear polite sign... 'Please close the door behind you'. Tis lrft at's reasonable enough as it's winter and its chilly. However, as it's winter the door has swollen and is very difficult to pull properly closed.
That sign now takes on a very different messsge. The owner/staff will know the door is stiff but still the sign is there. So now the sign means that you're being expected to win the battle with the very stiff door. Be prepared to use all your might and make some noise.
Now that reasonable, clear and polite sign now seems like a much less reasonable customer test. In reality, the door Is left jammed against it's frame but not fully closed.
Right, off to the farm shop now, curious about what other unreasonable customer requests are yet to come.