Billie Eilish Performs "Bad Guy" on SNL in 2019 If you Googled how Billie Eilish climbed the ceiling in this performance, just know that you are not alone. (You can learn how here.) It's amazing how much she's bouncing around with a sprained ankle and bringing all of her energy to the set. "Bad Guy" is the pretty much the perfect song to kick off the season premiere of Saturday Night Live and definitely ushers us into all the creepy-crawly vibes of Halloween.