The running joke of Rory constantly forgetting about her boyfriend Paul in Gilmore Girls: The Revival.
Deb wanting to sleep with her brother on Dexter.
The reveal of A as Spencer’s evil British twin on Pretty Little Liars.
Jess and Robby finding out they were cousins on New Girl.
The alien storyline in American Horror Story: Asylum.
Isabel and Denny’s “ghost” on Grey’s Anatomy.
Ross being infatuated with his cousin on Friends.
A dog eating Dan’s heart transplant on One Tree Hill.
Luke having a daughter on Gilmore Girls.
The cheese-wheel murder in Midsomer Murders.
Betty trying to join the Serpents on Riverdale, and so performing a strip routine in front of her mum and a random group of men.
Snow and David stealing innocence from Maleficent’s baby in Once Upon A Time.
Marie’s kleptomania storyline on Breaking Bad.
Zelda and Father Blackwood’s affair in The Chilling Adventures of Sabrina.
Jughead kicking up a storm about not being able to wear his gang clothes to school on Riverdale.
Finn praying to a grilled cheese sandwich on Glee because it has Jesus’ face on it.
Tom and Ann dating on Parks and Recreation.