Lets hear 'em! Of course all day, every day, works just fine. But really the best environment would have to be a brewery with stripper poles between each keg. (With strippers included of course) But to be more seriouse, I think I enjoy Thrash most when there are many other Thrashers around me enjoying it/headbanging/singing along at the same time, getting a good vibe going. And of course there would be plenty of booze!