1. First, on Grey's Anatomy, when Addison revealed that she was Derek's wife.
ABC
2. When Rachel entered Central Perk in her wedding dress on Friends.
NBC
3. On The Walking Dead, when a cloaked Michonne killed some walkers and saved Andrea.
AMC
4. When Lorelai begged Luke for coffee on Gilmore Girls.
Warner Bros.
5. When Damon Salvatore reunited with Stefan on The Vampire Diaries.
The CW
6. When Walter White was driving the RV in just his underwear on Breaking Bad.
AMC
7. When Annalise introduced her class on How to Get Away with Murder.
ABC
8. On Supernatural, when Castiel arrived on Earth.
The CW
9. When Moira was packing her wigs on Schitt's Creek.
Pop / CBC
10. On This Is Us, when Jack was naked under the Terrible Towel.
NBC
11. On One Day At A Time, when Lydia opened up the curtains to her bedroom.
Netflix / Pop
12. When Leslie tried to get the homeless man out of the slide on Parks and Rec.
NBC
13. When Jack woke up in the jungle after the plane crash on Lost.
ABC
14. On The Good Place, when Eleanor woke up in the Good Place.
NBC
15. When Spike ran over the Sunnydale sign on Buffy the Vampire Slayer.
Warner Bros.
16. On How I Met Your Mother, when Tracy McConnell aka The Mother arrived at the train station.
CBS
17. On Wynonna Earp, when Waverly shot at Wynonna.
SYFY
18. On Arrow, when Felicity Smoak was chewing on a red pen.
The CW
19. When Glenn Rhee came over the radio to talk to Rick on The Walking Dead.
AMC
20. When President Bartlet arrived and gave his first speech on The West Wing.
NBC
21. When the Evil Queen interrupted Snow White and Prince Charming's wedding on Once Upon A Time.
ABC
22. On Orphan Black, when Sarah came face-to-face with Beth for the first time and realized she was a clone.
BBC America
23. On The Marvelous Mrs. Maisel, when Midge gave a speech at her own wedding.
Amazon Prime
24. When Stiles swung down and scared Scott on Teen Wolf.
MTV
25. When Cheryl was sitting alongside Sweetwater River on Riverdale.
The CW
26. When the 13th Doctor made ~HER~ first appearance after losing the TARDIS on Doctor Who.
BBC America
27. On Gentleman Jack, when Anne Lister recklessly drove the carriage back to her home town.
HBO
28. When Nicole flirted with Waverly on Wynonna Earp.
SYFY
29. When Villanelle flipped a little girl's ice cream on Killing Eve.
BBC America
30. On Buffy the Vampire Slayer, when Dawn suddenly appeared as Buffy's sister.
Warner Bros.
31. And finally, when Marissa met Ryan for the first time on The O.C.
Fox
