Boards
Brits who are only famous in the USA (and vice versa)
Like Craig Ferguson. Has his own show in the States, household name, but he could walk into any pub in the UK and no one would give a shit.
Likewise, you can't watch a chat show or quizcom these days without Reginald D Hunter doing his schtick, but apparently no one in the US has the slightest clue who he is.
More of these please.