Quote from Phoebe in The One After Vegas
Phoebe: Hey. Monica: What are you guys doing here? Joey: Ross and Rachel left us a message saying they were getting married. Isn't that why you guys are here? Chandler: Yes. Monica: Why else would we be here? Joey: Well, what happened? Did we miss it? Chandler: We actually missed it. Phoebe: Maybe you wouldn't have if you could run in the chapel!