In the season four opener, Jake befriends a hyena named Rufus, who's endless laughter drives Adam crazy.
- Annoying Laugh: Rufus' laughter, obviously. However, his crying was even worse.
- Art Shift: Mr. Mandrill's design looks significantly different in this episode.
- Bathroom Stall of Overheard Insults: In the bathroom, Adam boasted a strong-worded rant about how much he hated Rufus and his annoying laugh, only for Rufus to come out of the stall, having heard all of that.
- Continuity Nod: The Laugheteria from "Yesterday's Funny Monkey" returns, as one of Adam and Jake's ideas on how to get Rufus laughing again.
- Dissonant Laughter: Rufus was cracking up and laughing, while Adam read his oral report on The Shipwreck of The Titanic.
- Ear Ache: Rufus' incessant laughing, annoys Adam's ear right off the side of his head.
- I Lied: Windsor said that hyenas need to laugh in order to survive, scaring Adam into making Rufus happy again.
- Jumping Off the Slippery Slope: Nurse Gazelle when she chases Rufus Hyena trying to shave his fur off. Doesn't seem too evil? Well, Rufus was in a state of shock and depression and was busy crying his eyes out because Adam insulted him. The nurse doesn't care about Rufus' feelings or emotional well-being; she outright terrorizes him while he's in a sad mood by chasing him with clippers just so she can make herself laugh. Also, keep in mind that Rufus is only a kid and would most likely get emotional scars from the incident. Sure, no blood was shed but the psychological trauma Rufus Hyena has to endure is just sickening and gut-wrenching.
- Must Make Her Laugh: The central conflict of the episode, was that Adam and Jake needed to make Rufus laugh, but most of the stuff they did, failed.
- "Not Wearing Pants" Dream: Adam tells Jake about a dream he had about going to school in his underwear, only for Jake to mention that it actually happened.
- Pie in the Face: One of Adam's attempts at making Rufus laugh, was allowing Jake, who was dressed as a clown, pie him in the face.
- Rube Goldberg Device: There's an entire "Rube Goldberg Hallway" at Charles Darwin Middle School. It's completely pointless, only relevant to this episode, and causes harm to people such as Adam.Pixiefrog: I thought we shut down the Rube Goldberg wing. That's a lawsuit waiting to happen.
- Rule of Three: Adam and Jake try three things to make Rufus laugh, before Adam gets antsy.
- Stomach of Holding: Slips was a kickball pitcher, who pitched by barfing up the kickball.
- Suddenly Voiced: Rufus doesn't talk until the end of the episode, when he finally laughs again, and he has a boyish, British accent.
