Juxtaposition in Reservoir Dogs

In the famous ear cutting scene in Reservoir Dogs juxtaposition is used with music, in this scene Mr. Blonde  tortures a tide up police officer by cutting off his ear, absolutely grotesque and a horrible thought, let alone someone in a film actually doing it. Quentin Tarantino makes this scene almost humorous by playing an upbeat song (stuck in the middle with you) and having Mr. Blonde dance around and having him enjoy himself whilst he's doing it. Tarantino somehow manages to lighten this scene by playing this.