Two wives go on a girls night out. On the way home much the worse for wear they're both busting for a P but there are no toilets open so they hop over the wall of a cemetery and squat behind a couple of gravestones.
Next morning one of the husbands phones the other and says, "That's the last time my wife goes out with yours, she came home with no knickers on". The other one says, "You think you've got problems mate, mine came in with a card stuck to her wotsit saying 'From all the lads at the firestation, we'll never forget you"