We recently asked members of the BuzzFeed Community which actors they've been surprised to learn were in certain TV shows. Here are the best responses. 1. Zac Efron — Firefly F "Zac Efron as the young Simon in Firefly." —littlebrowndoggy 2. Dylan Minnette — Grey's Anatomy ABC "Dylan Minnette (Clay from 13 Reasons Why) was in Grey's Anatomy." —aylar3 3. Jennifer Lawrence — Monk USA Network "I was watching old Monk reruns and someone in a lion mascot costume walks into the locker room and takes off the head, only to reveal Jennifer Lawrence is underneath! She's even referred to as Jen!" —idyemyhairalot 4. Chris Hemsworth — The Saddle Club ABC —Klara Dvorak, Facebook 5. Zooey Deschanel — Frasier NBC "Zooey Deschanel as Roz's snarky and hipster cousin on Frasier! Not only is a blonde Deschanel bizarre, her too-cool-for-school attitude couldn't be more different from Jessica Day." —brookev44d349812 6. Aaron Paul and Jane Lynch — The X-Files Fox "Playing (respectively, in the same episode) a high school stoner and a high school principal. AMAZING." —caroliner4f34a2a95 7. Andrew Garfield — Doctor Who BBC "Andrew Garfield in Doctor Who. I rewatched that episode one day and was like holy shit... that's him." —stevenlegits 8. Steven Yeun — The Big Bang Theory CBS "Steven Yeun aka Glenn from The Walking Dead on The Big Bang Theory as Sheldon's old roommate." —616489 9. Millie Bobby Brown — NCIS CBS "Millie Bobby Brown (Stranger Things) played a sociopath who killed her mother on NCIS." —KT Phillips 10. Emma Stone — Malcolm in the Middle Fox "Blew my mind seeing Emma Stone in an episode of Malcolm in the Middle." —Tor Harbin, Facebook 11. Ryan Gosling — Goosebumps YTV "Ryan Gosling on Goosebumps! 'Say Cheese and Die'!" —cumberbabe1395 12. Joe Manganiello — One Tree Hill The CW "Whenever anyone starts talking about Joe Manganiello being on True Blood or Magic Mike, I like to remind them that we had him first as Owen on One Tree Hill." —DeAnna Hall, Facebook 13. Gabriel Macht — Beverly Hills 90210 Fox "Seeing Gabriel Macht from Suits on Beverly Hills 90210 was probably the most cool yet WTF moment of my entire life!" —quadryillduce 14. Rami Malek (from Mr Robot) — Gilmore Girls Warner Bros —Ian Vicencio 15. Ethan Suplee and Adam Scott — Boy Meets World ABC "Adam Scott as Griffin Hawkins and Ethan Suplee as Frankie Stechino, Cory's bullies, in Boy Meets World." —b47d45633e 16. Courteney Cox — Murder She Wrote CBS "Courteney Cox in Murder, She Wrote! Makes me laugh every time I see her." —Hanna McGrath-Perdue, Facebook 17. Zach Braff — The Baby-Sitters Club HBO "Zach Braff in 'Dawn Saves the Trees'." —DeAnna Hall 18. Max Greenfield — The OC Fox "He was young Sandy Cohen on The OC!" —Denise St. Pierre, Facebook 19. Matthew McConaughey — Unsolved Mysteries CBS "I was very surprised to find out Matthew McConaughy was in an episode of Unsolved Mysteries. I had to go back and rewatch the episode (it's on the DVD set). It's so weird to see, yet he does a great job in such a sad story. I remembered the story, but when I first saw it I clearly had no idea that he would become such a famous renowned actor." —laurelc3 20. Shia LaBeouf — Freaks and Geeks NBC "Honestly, I was surprised by everybody who appeared on Freaks and Geeks but seeing little Shia LaBeouf as the injured mascot will always surprise me. Still so cute and so hilariously Shia even all the years ago." —serinaholguin 21. Amy Adams — Charmed CBS "Watching old episodes of Charmed and Amy Adams pops up playing a good samaritan who is tapped by a 'dark lighter' demon that makes her so unlucky she wants to jump off a building. Thankfully she is saved by the Power of Three and lives to become an Oscar-nominated actor. Phew!" —alvarof4f1bc732e 22. Nick Offerman — The West Wing NBC "Nick Offerman (Ron Swanson) had a cameo in The West Wing long before Parks and Recreation! He played Jerry (yes Jerry!) in the Season 1 episode 'The Crackpots and These Women'." —pavlovabunny 23. Mila Kunis — 7th Heaven The WB "Mila Kunis on 7th Heaven as Lucy's frenemy Ashley, before she was on That '70s Show." —stephaniemedina56 24. Jeremy Piven — Seinfeld NBC "Jeremy Piven from Entourage auditioning and getting the role of George in the pilot of 'Jerry' in Seinfeld." —Dean Nye 25. Lin Manuel Miranda — How I Met Your Mother CBS —Jocelyn May, Facebook 26. George Clooney — The Golden Girls NBC "George Clooney played a cop on The Golden Girls." —Liz Boccolini 27. Evan Peters — The Office NBC "Evan Peters as Michael Scott's nephew in The Office. I couldn't stop laughing when he got spanked in front of the entire staff." —Stephanny Paz, Facebook If you want to be featured in future BuzzFeed posts, make sure to follow the BuzzFeed Community on Facebook and Twitter.