An­gry guy: Hey, what the fuck, man? You fuckin’ crazy, jack­hole? What the fuck you doin’, man?
Be­wil­dered guy: I’m not do­ing any­thing…
An­gry guy: Be fuckin’ nice, man! What the fuck is wrong with you? Be fuck­ing nice!
Be­wil­dered guy: Well, then, you be nice, too.
An­gry guy: Do not fuck with me. I will fuck you up! Do not fuckin’ mess with me!
Be­wil­dered guy: I’m not mess­ing with you!
An­gry guy: Okay. Have a nice day.

–F train