The Honeymooners (1955)

Season 1: Episode 37

While Ralph and Norton are playing a game at the pool hall, Ralph gets into an argument with a mousy little guy who threatens to "tell my friend Harvey on you". Ralph, figuring anybody named Harvey who's a friend of this guy must be as wimpy as him, tells the guy to "bring on Harvey" and brags that he'll beat up the both of them. Harvey turns out to be a tough, hulking bruiser, and challenges Ralph to a fight at the local gym. Ralph frantically looks for a way to get out of it.