15. The One With Monica And Chandler's Wedding - Part 2 (S7E24)
Ross attempts to track down Chandler, while Rachel tries to stall Monica. Eventually, the couple tie the knot.
Why It's Great
Friends does its wedding episodes brilliantly, with a mix of emotion, humour, and twists, and this is the best of the bunch.
There's a lot to laugh at in the build up, especially Ross trying to coach Chandler through things and his brief re-disappearance, but it's when we get to the alter the real magic happens.
Monica and Chandler getting married, after three seasons dating and seven as close friends, is immensely pleasing, with their vows to each other a particular tear jerker. On top of that, though, comes the big revelation to end the episode and the season: it's Rachel who is pregnant!