After staying up for a week straight, Finn and Jake have difficulty sleeping, because a creepy horse is constantly watching them from outside their house.
- Body Horror: When Jake blindfolds the horse, the horse's eyes wriggle out from under the blindfold.
- Captain Obvious: Finn demonstrates his mastery of the obvious:(Horse drops into Finn and Jake's bedroom)
Finn: It's in our house now!
Jake: That's OBVIOUS Finn; you don't have to say it out loud!!
- Fourth Wall Psych: Finn tells Jake he feels like they're being watched. He and Jake turn to the camera... and the camera zooms out to show they're looking out the window at the Staring Horse.
- Foreshadowing: At the beginning, Finn and Jake recall the adventures they've had over the past week. One of these involves rescuing a princess from the Ice King, who says "I just want to be happy!" Turns out, he's wearing the horse costume to try to find out how Finn and Jake are so happy.
- Hijacked by Ganon: The horse is the Ice King in disguise.
- Kubrick Stare: What the horse does.
- Literal Ass-Kicking: This is how Finn ultimately plans to get rid of the horse. It leads to him discovering the horse is really Ice King in disguise.
- Long Speech Tea Time: The Ice King gives a long speech about how unhappy he is, and how much he envies Finn and Jake and wanted to understand how they can be happy. At the end it's revealed that Finn and Jake have gone to sleep.
- Monster Sob Story: The Ice King reveals once again just how pathetic he is.
- Noodle Incident: The various adventures Finn and Jake have had over the last seven days.
- Reality Ensues: The Ice King casts an ice-control spell with a very intimidating lightshow, but the only ice nearby is a few ice cubes in Finn and Jake's larder, which fly out and hit them very unimpressively.
- Released to Elsewhere: When Jake suggests disguising the horse as a bunny so hawks will eat it, Finn is horrified. Jake then tells Finn that the hawks will take the horse to a lovely island somewhere.
- Shout-Out: The Horse was confirmed by Word of God to be based on Fat Pony from Hark! A Vagrant.
- Sleep Cute: Finn, Jake, and the Ice King at the end.