Something similar, years back when I was taking Norwegian classes, my teacher was telling us about a relative of hers. According to our teacher, it was pretty common for families with the means to do so to send their kids off to an English-language immersion camp over the summer around the time they were 14 or so. She said most of the people would go to camps in the UK and come back with something of a posh British accent, but her one relative's parents dropped the ball on signing up and missed the chance to send her there, as all the spaces were booked by the time they checked. They looked around and found another immersion camp that was still accepting applications, and sent this girl off to perfect her English, in Arkansas. She came back with quite the accent, leaving people she spoke to in English baffled at how she wound up picking it up.

I live in sweden and know some swedish(still learning it) and when i was in iceland and asked for basic stuff they understood me and i understood them but when i go to denmark and ask for the toilet i dont understand a single word.