At a recent reception we performed at, the Bride and Groom provided us with tiny slips of paper. Each paper had a couples' name on it that was attending the reception.
At the beginning of the event, we were asked to announce to the guests that each time glasses were clanged, we would draw a couples' name from the basket and they would have to kiss along with the Bride and Groom.
By the time dinner was over, the crowd was having a great time with it. They were clinging glasses just to see who would get called next. The guests even tried to out do each other's kisses.
I imagine that this idea is not for every crowd, but it sure was fun!