And I feel so stupid. I am on Season 5 of The Wire, for pete's sake. The amazing thing about his performance as a Baltimore cop isn't just the accent though. His mannerisms are so American. I am just blown away. I have searched out video of him speaking in his natural accent and it almost doesn't seem like the same person. And I am apparently the last person on Earth to know this, since I haven't seen his performances in anything else.
I'm remembering the episodes where he went undercover to catch this human trafficking ring at a brothel, and did a "fake" English accent. It totally sounded fake! Some kind of linguistic genius, as far as I'm concerned.