OK - the usual male-female one. (NO, not that usual!)
A spicey young thing (OK, make her middle-aged) once married a wealthy old f... . But he got back at her, making her promise that when he dies, she would put all his money in the coffin with him.
Cometh the day, and she tearfully placed a fairly large (heavy) box in the coffin, friends looking on agast. Burial, blessings, earth-to-earth and earth on top and so on. One friend hazarded: "But - er - you surely did not actually BURY the money with him!?" She did, she said; after all a promise is a promise ...... "But - how?" "Oh", replied the grieving widow. "I placed a cheque in the box....."