We've got something simillar:
There was this giant (can't rememer his name) who got pissed on this other giant (can't remember his name either). To make things clear the first one lived in Sweden and the other one lived in Finland.
OK, so this giant in Sweden takes a piece of the land and tries to throw it at the other guy. But since he's very weak (and he's a terrible aimer) it lands in the sea. So he takes out another piece of the land and throws it at the other guy. Same result. OK, so the pieces of land turned into Swedens two largest island, Gottland and Öland. And the place he took the land from (where there now where two big holes) were eventually filled with whater, and turned into Sweden's two biggest lakes, Vänen och Vättern.
Übereil