"Man of honor" (instead of Maid) passes out / faints during his sister's wedding ceremony. He falls down.
Wedding party poses for a picture on a dock above a lake. Dock breaks and they all fall in. Someone says "You're gonna win 10 grand!"
2 white geese attack groomsmen by pond at wedding reception. Chase, bite at feet, knock them over. Goose, duck. Man's fall partially hidden by tree. Best man.
Big chunky white guy at wedding reception dancing funky to "Beat It"
Groomsman faints, he falls across the altar out of frame