In Reservoir Dogs (1992), Joe assigns code names to a group of people: Mr. Brown, Mr. White, Mr. Blonde, Mr. Blue, Mr. Orange, and Mr. Pink. One person questions why they were assigned the name “Mr. Pink” and Joe responds with an offensive remark. Mr. Pink asks why they can’t choose their own code names and Joe explains that it has caused problems in the past. Joe insists on choosing the code names and tells Mr. Pink to be grateful they were not assigned “Mr. Yellow.”:
Joe: You're Mr Pink. Be thankful you're not Mr Yellow.
Why would being called "Mr. Yellow" be undesirable?