There's always one guy at the wedding who's too hyped up to get on the dancefloor and show off his moves, and in this case, it was one of the groomsmen.
As he entered the room with his accompanying bridesmaid, the two looked to be having a great time as they headed for the dancefloor. The groomsmen, whips off his jacket, throws in a fancy cartwheel, and then goes a step too far as he does a backflip that goes horribly wrong.
He quickly tries to pick her up afterwards, but she's clearly dazed and unable to stand without some help. Something tells us that he wasn't the most popular guy at the wedding for the rest of the evening.
So, the lesson here is to just walk calmly on to the dancefloor with a deep sense of shame, and awkwardly shuffle around like the rest of us.