Lou Avery and Don
I've just been rewatching S6, and in the finale when Don's essentially fired and Duck and Lou show up in the elevator, Don says he and Lou had met before.
I don't recall Lou from earlier episodes, or that he and Don had met before. It must have been a brief encounter I just don't remember. Does anyone else? What were the circumstances, and which season. Episode would be nice too, but even the circumstances and season would help.