Season 10: Episode 228: The One with Phoebe's Wedding
Phoebe's Dad can't come to the wedding, so she asks Joey to walk her down the aisle; he plays the overprotective father figure a little too well. Phoebe is driven crazy by her wedding planner - - Monica. Chandler and Ross realize they aren't in the wedding. When one of the groomsmen drops out, they compete for the spot.