Quote from Carla in Battle of the Exes
Carla: Sam, you were the greatest tonight. I got to thank you for putting up with all that. Sam: Are you kidding me? I had a terrific time. You know, somebody should have said something to Nick. He went through the ceremony with his fly open. Carla: Oh, he knew. It's a tradition in his family. Sign of fertility. Didn't you notice his father and all the ushers? Sam: Oh, that's right. Yeah, well, that explains it. I thought it was because the building was a little stuffy. In fact, I flirted with the idea myself.