This is a rather skillful mashup of Lady Gaga's "Bad Romance" with Polish blackened death metal band Behemoth's "Ov Fire and the Void". I think I may like the combination of these two artists better than either separately. I particularly like the way Lady Gaga's vocals play off against Nergal's death growl. I'd love to hear the two do a proper duet. (There's actually a Youtube clip on the making of the video for "Ov Fire and the Void" in which Nergal pretends to interview a pig that appears in the video, and is impressed to learn that the pig has previously starred in a Lady Gaga vid. So maybe he's a fan?)
Warning: Video contains disturbing imagery, including assorted violence, latex-coated people, angelic cannibalism, freaky pregnancy, and long-haired Polish guys in ridiculous make-up.