Yeah I saw at a wedding last year the following, although it's entertainment more than a game.
The best man (or bridesmaid, or anyone) has a list of 10? questions for the newly married couple. e.g 1. FAVOURITE COLOUR, 2.FATHER-IN LAW'S MIDDLE NAME, 3.PARTNER'S WORK-PLACE PHONE NUMBER, 4. WHERE IS YOUR PARTNER MOST TICKLISH? etc
After each question the bride or groom will say whether the partner is right or wrong. Obviously the bride or groom with most correct answers wins if they have more insight or memory than their partner! The guests can find this amusing 'cos sometimes one partner has no idea in hell of the other one's interests or facts etc. There's no prize...it's just amusing. I liked it a lot!