When your boyfriend is being a douchebag, sometimes you just need Danny Trejo (of 'Breaking Bad' and a million other things) to come in and tell you what's what. This is precisely what Dustin Tavella does in his new video for 'Everybody Knows (Douchebag),' which features Selena Gomez!

Although Sel is only in the video for a bit at the end, we now know why she and her buddies were choreographing a dance to this song-- their handiwork appears in this clip! Is Selena appearing in this video to throw shade at Justin Bieber or is she just doing a favor for a friend? Guess we'll never know! (She def wanted to throw shade at the Biebs.)