"Doug fuck off."

I don't wish to be overly pedantic, but the sentence above requires a comma between Doug and fuck. The reason is this: Doug is the subject of the sentence; however, there is an implied subject before fuck. That would be 'you'. So, if you had written, "Doug, YOU fuck off", I'm sure you would have supplied the comma.

I just thought I'd mention that. GUEST, please be nice to Doug. He's Republican, but he's also a good guy.

BM