What's the deal? "For a lot of people, it's about being seen," Miley explained. "Everybody goes. There's tons of celebrities there, you know," she scoffed. That's when Ellen had her millennial epiphany: "So if someone posted a picture of themselves at Coachella with food, Instagram would just burst into flames." Finally, Miley helped Ellen understand why people always seem so happy at festivals. It must be because "they're high on life," Ellen suggested. Miley grinned. "Definitely," she said.