When they speak English, it's usually with an American accent. Thanks, no doubt, to all those US telly programmes and Hollywood films...
I sometimes get a giggle, though, when Danes try to pronounce English words that start with W and V. Because in Danish the letter W is pronounced as V. So when they speak English, they can get confused. Village turns into willage. Wellness into vellness. Whisky into visky. [On a side note, when I first arrived in Denmark in 1998, all surnames beginning with either V or W were lumped together in the Danish phonebook.] One of the first things DH remembers learning at school was the exciting phrase "Very well, Vivian" ;)
But my favourite is when DS10 and his friends are talking about Star Wars [Which, on another side note, we L.O.V.E. in this house]. Just who is Luke's father? Darth Wader! Yep, imagine big old Lord Vader walking around in fishing waders... He suddenly seems a lot less scary, n'est-ce pas?