Marceline and her ghost friends trick Finn and Jake into believing that they have become vampires, but the ghosts threaten to take the prank too far.
- Bedsheet Ghost: The three ghosts look like this.
- Big "NO!": LSP gets a cool slow-motion one when Finn kicks over her can of beans.
- Blatant Lies: Finn and Jake's promise to stay away from the ghosts' house.
- Calling Your Attacks: Finn performs a "Vampire Kick!", followed by Marceline calling the exact same attack shortly after.
- Combat Tentacles: The ghosts grow these to suck out Finn and Jake's brains.
- Conscience Makes You Go Back: Played with; Marceline's guilt causes her to go to Finn and Jake as the ghost try to kill them, but she doesn't try to save them (because she doesn't think she can).Finn: You're here now to beat up those ghosts and save us!
Marceline: Oh, no, vampires can't beat ghosts... It's like a rock-paper-scissors thing. I just came to apologize.
Finn: Aw, man...
- Deadly Prank: Played with; Marceline's ghost friends actually wanted Finn and Jake to die. They and Marceline had tricked Finn and Jake into thinking they were vampires, whose powers include flight. The extended prank culminated in the ghosts teaching them how to fly by knocking them off a tower (Marceline, drawing the line at actual harm, catches them). The ghosts did it because it would have been funny.
- Everyone Has Standards: Marceline is OK with tricking Finn and Jake into acting stupidly, and trashing Lumpy Space Princess's campsite, but is not happy when the ghosts start genuinely injuring Finn and Jake.
- Jerk Witha Heartof Gold: Marceline had no qualms pranking Finn and Jake and trashing Lumpy Space Princesses home, but she was willing to rescue her friends when almost killed.
- Killer Rabbit: The three ghosts look like cute cartoon Bedsheet Ghosts, but are genuinely evil.
- Our Ghosts Are Different: Not only are they jerks, but have a natural superiority to vampires.
- Two-Faced: Booboo literally has two faces, vertically stacked.
- Vampire Vannabe: Finn and Jake temporarily become this.