I was just catching up on the etiquette faux-pas thread while simultaneously watching "The 40 Year Old Virgin" on TV. At the end of the movie, Steve Carrell gets married and right after the ceremony, he takes his wife to their hotel room and they have sex for 2 HOURS. Where did their guests go? Are they waiting somewhere in the reception venue or did they have to go home after the ceremony?
So it got me thinking, what are some others you can think of? Another one that comes to mind is the episode of "Friends" where Monica throws a gross little hissy fit right after she and Chandler get engaged, when she assumes her parents have a bunch of cash saved up for her wedding and then she finds out they don't.