5. Alicia puts Peter in his place.
Alicia and Peter always find a reason to tear into one another. So when Alicia gets word of Peter supposedly having another affair it sends her over the edge. When she confirms Peter really did have an affair, even worse that it was with Ramona, it led to one of the greatest lines ever delivered in primetime: "Zip up your pants, shut your mouth, and stop banging the help."
Season 6, Episode 9