If anyone's heard of Dara O'Briain or Dylan Moran - they are my stereotypes for strong Irish accents.
Geordie is easy - I know a couple. Brummie and Scouse are a bit different, don't know anyone from there so I don't really get them.
America-wise, I have no real problem, but what gets me is why every waitress says "ah-ha" at the end of a statement, e.g. "You have a nice day now, ah-ha" Any explanations?