|Finn holding the Boomerang Bottle|
|Introduced in||"The Duke"|
The boomerang bottle is a green bottle that Finn threw in the episode, "The Duke." It acts like a boomerang when thrown, and when Princess Bubblegum was hit by it she turned green, lost most of her hair, and got generally angry. This may be an "ugly potion" of sorts.
A green, boomerang-shaped bottle with a cork cap it also resembles a shape of a banana. Because of its shape, it functions as a boomerang.
Finn and Jake were seen throwing bottles from a wheelbarrow at a wall. Finn then finds the Boomerang Bottle. He states that it looks stupid and then becomes interested because he wanted to see how it would fly. He then threw it but, being the shape of a boomerang, it turned direction and broke a window in Princess Bubblegum's Castle. Princess Bubblegum was in the room, and her skin and hair color turned green and she lost a lot of hair for several days. Unfortunately, she thought that the Duke of Nuts threw the potion. She then commands Finn and Jake to arrest the duke.