My husband and I once got to help translate between a Scottish hostel host and a German cyclist. Both of them understood us perfectly because of American TV. Both were 90-95% comprehensible to us, but when they talked to each other it was blank, confused looks all around. My favorite part is when she was so flustered she couldn't remember another word for "loo" and the poor German guy was standing there awkwardly until my husband burst out "TOILET IS DOWN THE HALL."

Overall, I think most NH accents are considered perfectly understandable outside of home. We certainly have our little quirks but nothing too outlandish.

My former Wisconsin boss thought "wicked" was an exaggerated joke until she visited. But they say "horse a piece" instead of "six of one" and when you mix it with a Bostonian understanding of expressions it sounds like "horse of peace" which is incomprehensible.