The Bullwinkle Show Season 2 Episode 8

Rocky: (after failing to catch up to the train) Well, there it goes.
Bullwinkle: You go on and fly after it, Rock. You can still catch it.
Rocky: And leave my pal stranded here? Never!
Bullwinkle: Gee, you're a real pal-type pal, Rock.
Boris: Look at that, Natasha. Sometimes I wish I had a friend.
Natasha: Why?
Boris: So I could double-cross him!
Natasha: You would double-cross friend?
Boris: I got to. My enemies don't trust me.