On page 265 of "
Let Me In" (the novel version of
Låt den rätte komma in/Let the Right One In), a group of kids on public transportation were singing "Habba-Habba-soudd-soudd!", otherwise known to geriatric anime fans as the song used in that old but awesome AMV,
Jinnai and the Bugrom.
I guess it makes sense, since the novel takes place during 1981 in Sweden, and the song was made by the two guys from ABBA after the group split up.