20. Getty Images / Kevin Winter / Via buzzfeed.com Who: The cast of Old School.Where and/or why: To accept the Hall Of Fame award at the Guys Choice Awards. 19. Who: S Club 7.Where and/or why: A performance on an Australian morning show, which you can watch here. 18. Cindy Ord / Getty Images Who: Jennifer Garner and Victor Garber of Alias.Where and/or why: An art gallery opening. 17. Who: 2Gether, the fake boy band (minus QT)Where and/or why: No one is quite sure, but at least we know they can still sing! 16. Stephen Lovekin / Getty Images Who: The cast of The Princess Bride.Where and/or why: The movie's 25th anniversary. 15. Who: Chevy Chase, Beverly D’Angelo, Jason Lively, Anthony Michael Hall, Dana Barron and Juliette Lewis from the National Lampoon Vacation movies.Where and/or why: An Old Navy commercial. 14. buzzfeed.com Who: Alyson Hannigan and Seth Green of Buffy The Vampire Slayer.Where and/or why: On the set of How I Met Your Mother. 13. buzzfeed.com Who: The cast of In Living Color.Where and/or why: The TV Land Awards. 12. buzzfeed.com Who: Brandy and Monica.Where and/or why: Another duet! 11. buzzfeed.com Who: The cast of Malcolm In The Middle.Where and/or why: The show's six-year anniversary. 10. Entertainment Weekly / Via buzzfeed.com Who: The cast of The Larry Sanders Show.Where and/or why: In the pages of Entertainment Weekly. 9. Who: Jason Priestley, Jennie Garth, and Luke Perry of Beverly Hills, 90210.Where and/or why: A set of Old Navy commercials. 8. Frazer Harrison / Getty Images Who: The cast of Firefly.Where and/or why: San Diego Comic Con. 7. Entertainment Weekly / Via buzzfeed.com Who: The cast of Clueless.Where and/or why: Entertainment Weekly's reunions issue. 6. buzzfeed.com Who: The cast of Full House.Where and/or why: The show's 25th anniversary. 5. Who: The cast of The West Wing.Where and/or why: A Funny or Die video. 4. Entertainment Weekly / Via buzzfeed.com Who: The cast of Arrested Development.Where and/or why: Entertainment Weekly's reunions issue — and to film a new season of their iconic show for Netflix. 3. Via buzzfeed.com Who: The entire cast of Freaks and GeeksWhere and/or why: For Vanity Fair's comedy issue. 2. Jeff J Mitchell / Getty Images Who: The Spice GirlsWhere and/or why: The London Olympic Games. 1. Tap to play or pause GIF Tap to play or pause GIF Mike Rosenstein / Via sfsketchfest.com Who: The cast of Wet Hot American Summer.Where and/or why: A performance of the movie at SF Sketchfest — and to discuss the upcoming sequel (!!). What was your favorite reunion of the year, BuzzFeed?