The provided text appears to be a transcript of a video showcasing various instances of celebrities surprising their fans in unexpected ways. The transcript includes multiple scenarios such as Katy Perry going undercover at an art exhibition, the Stranger Things cast posing as wax figures, and many more. Other notable mentions include Giannis Antetokounmpo taking time to interact with a young fan, Michael B. Jordan visiting his old high school, and Barack Obama surprising hikers in Hawaii. The video also features surprise appearances by Chris Hemsworth, Billy Eilish, Beyoncé, Harry Styles, Rihanna, Ariana Grande, and Taylor Swift, among others.
Here are the key facts extracted from the text:
1. Katy Perry collaborated with Vanity Fair to go undercover at an art exhibition.
2. Katy Perry's head was sticking out of a dish during the exhibition.
3. Shawn Mendes surprised a fan on a radio show in Stockholm, Sweden.
4. Chris Hemsworth crashed a live weather report in Australia.
5. Billy Eilish surprised some of her fans who were trying out a new game.
6. Daniel Radcliffe filled in as a receptionist at the Nylon offices for a couple of hours.
7. One Direction invited a couple of fans on stage to play a game during a performance.
8. The Rock and Jimmy Fallon surprised a staffer on the Jimmy Fallon Tonight Show.
9. Taylor Swift communicates with fans on Tumblr and has revealed herself to some of them.
10. Giannis, an NBA player, took the time to look at a young fan's artwork and gave her a hug.
11. Michael B. Jordan visited his old high school after finishing a movie.
12. Jonah Hill was pranked by Leonardo DiCaprio, who pretended to be a crazy fan.
13. Barack Obama was spotted climbing the stairs at the Coco Crater Trail in Hawaii.
14. Ariana Grande and Jimmy Fallon surprised some fans who were doing covers of their songs.
15. The Avengers cast surprised some fans at the Jimmy Kimmel show by hiding behind a cardboard cutout.
16. Beyoncé joined a dance routine during a flash workout in New York City.
17. Harry Styles surprised some fans who were doing a listening session for an unreleased album.
18. Kylie Jenner surprised a fan on the Ellen show and gave her a tour of her headquarters.
19. Rihanna surprised some fans in the subway when she was on tour in London.
20. BTS has a fan base of around 130 million fans.
21. The band's members can no longer fly in commercial planes due to overzealous fans.