The Biting Ritual is a ceremony that Marceline creates in the episode "Heat Signature." She leads Finn and Jake to believe that its effects will turn them into vampires. Before the ritual begins, Marceline tells Finn and Jake to close their eyes, saying that if they open them before she says to, their heads will explode. Marceline pinches Finn and Jake's necks, saying "bite" and "chomp" as she pretends to bite them. She then puts ketchup on her fingers and leaves small drops of it on their necks to resemble blood. This fake ceremony leads to the made-up trials of Vampire Orientation. Marceline intends the ordeal to be an innocent prank on Finn and Jake.