After "The most embarassing moment in the history of mankind" and "The most embarassing moment in the history of mankind... second place!" the new experience to laugh your head off (if you are not the protagonist of course..) is set at the wedding... the perfect place for an Epic Fail!
The slip of the best man is ridicolous enough in and of itself, but having pushed the pastor and the bride in the pool, transform him in the worst best man ever (in his defence it must be said that probably the choice of the place has been a little unwise...)