While "bolle" means "to fuck" in Danish, it has a vastly different meaning in Norwegian. In Norwegian, "bolle" means "bun", as in the (sweet) cake. This makes for some pretty hilarious puns, since the two languages are otherwise quite similar.
"Bolle i aften?" -- could mean "Want a fuck tonight?" or "Do you want a bun tonight?" depending on what side of the Skagerrak you're on.