How awesome would that be? You go out to get the mail/package and it's Fenriz, blasting black metal in his little mail truck. Maybe he's even doing Isengard style vocals and everyone that hears him thinks he's drunk. It'd be even better if you were wearing a Darkthrone shirt at the time and he happened to notice it, and he salutes you with the horns. Then your neighbor asks what in the hell that was all about.
"Our mailman was fucking drunk!"
"Huh?"
"Yeah, he was singing about chocolate milk. Something about Nesle Quick, or maybe it was Neslepaks."