Quote from Cliff in How to Marry a Mailman
Cliff: No, mis amigos, I know exactly what's going on in that sexy little egg-shaped head of hers. She left me lo those many months ago to pursue a career. That wasn't enough. No sirree. She wanted her man back. Heck, you've seen my bumper sticker... "letter carriers do it on foot." Norm: Yeah, I have seen that. I always wondered what the hell it meant. Cliff: Uh, I'm not sure. They were giving them away free.