Season 2 when Adriana and Christopher have a spat at the restaurant while Tony and Carmela are seated with them (I think it's "D-Girl"). Adriana mentions not being asked to marry Chris yet and that's what starts it. Christopher mumbles something about the food and Tony says, "When you're married, you'll understand the importance of fresh produce!" Not rollin'-on-th'-floor funny, but I get a kick out of it because it shows a little of Tony's naivety.