Most of these are fairly good.
If you watch The Departed or The Sopranos, you end up randomly pronouncing words in a terrible Boston or New Jersey accent.
They say people with a "musical ear" pick accents up quicker than people without one, fun fact of the day (by "they," we mean some old guy in a pub told us).
The people over at
Facts decided to see how good these Irish people are at North American accents, here's how it played out.
https://www.youtube.com/watch?v=JVjL0i74Drw
Things we learned from watching that video.
YouTube credit: Facts.