Quote from Joey in The One Where Phoebe Runs
Chandler: Think about it. Remember when you were going out with that girl Donna and you guys broke up. Remember how horrible it was when you guys bumped into each other at the supermarket? Joey: Oh, God, yeah. Chandler: Now imagine you live at the supermarket. Joey: Okay! Chandler: No, no. Joey: Oh, oh. You're right. I don't want that. I can't date her.