Yo, how about this—hijack a friend’s Bluetooth speaker and set it to play Billie’s “bad guy” remix every time they try to take a selfie, so the background music keeps getting louder and the “speak” button keeps glitching. Or sneak a pair of those giant foam “Eilish ears” into their backpack, so when they think they’re just hanging out, they get a sudden, ridiculous hearing experience. Bonus: film the chaos for TikTok, caption it “When Billie meets your playlist.” Fun, right?