The Accent Toolbox

Funny enough the only accents I lack are good upper class ones. This rarely matters much in game,as the P.C's don't usually move in those circles. Still having a wide range of accents can improve RP fun, if you know when to use them and the other players don't mind or have real world issues with them.
I'd be curious as to what accents you can do well enough to get away with in game?

My list includes

Canadian (Toronto-ish)
Highland Scots via Groundskeeper Willie (like most gamers)
Generic Eastender/Chav
Bad Eighties Russian
"Bushie" Aussie complete with outdated strine.
Generic Native American (something like Graham Greene)
Northern Irish (I sound like Gerry Adams from Sein Fein )
Mexico City (learned in Spanish Class)
a kind of German via the Pulps
"Gangster" Italian
80's style Street Hood
L.A. Gangsta (this is more slang than accent)
Evil Southern Sheriff
Arkansas Regional via Slingblade
Boomhauer (from King of the Hill if you call that an accent. I use it for a Ghoul Clan)
and Generic Cowboy