The Jackal has arrived. But you might not see him standing there, being so stealth-like.
From "Weekend Warrior", a secretary informs Gus there's a 'Lt. Crunch' there to see him.
Shawn: Actually no, I've been promoted... It's Captain Crunch.
The only thing that makes this better is him walking in dressed in a Civil War military uniform, and then later dressing Gus up to look like he was commanding a marching band.
Two in "Rob-a-bye Baby": when Shawn and Gus are mistaken for creeps in the park and Shawn's marriage proposal.
This exchange from "Lassie Did a Bad Bad Thing" had this troper rolling for the tone alone:
Shawn: You really want to know my method? Lassiter: Yes! Shawn: It usually starts with a Holla!, and ends with a creamsicle. Gus: And if there's time in the middle? Thunder Cats. Hooo!
"I beg your pardon? My name is Black. His name is Tan. I can't believe you just made that assumption. You should be ashamed of yourself and your family."
From "Gus Walks Into A Bank": The hostage negotiator is rambling on and on about his family and making really ineffectual promises. The hostage taker obviously gets the insincerity behind it and rolls his eyes. It's funnier than it sounds!
Also, the time Shawn was trying to alert the police to a chop shop by faking a vision and describing it like a scene from a horror movie.
Shawn: Victims! I see victims everywhere! It's HORRIBLE! Sawed-off parts strewn about! Fluids spraying in every direction!
Vick: Oh, dear God!
O'Hara: Are we talking about a serial killer?
Shawn: I see the victims' names! Accord! Look out!
Gus: Get outta there!
Shawn: Escalade! Don't let him in the door! Oh, Camry, you were too young to go...
O'Hara: Are we talking about cars?
Shawn sending Gus (note: black guy) into a tanning salon as part of an investigation, and Gus actually attempting to make that fly.
Gus' list of rules for going into a supposedly haunted, abandoned mental hospital. These rules include refusing to be the first person to enter a room or the last person to leave a room (which, considering it's just him and Shawn, is a logical impossibility.)
Also from that episode, Shawn and Gus running and screaming like little girls from the (alleged) haunted sorority house. When Juliet comes out after them, Shawn tries to act all cool and collected and says he and Gus are going to compare notes-till Gus blows his cover by speeding away in the car.
Even better is that when Gus gets his foot stuck between floorboards and Shawn ditches him, he takes off his belt and starts swinging it around in a circle, in some sort of attempt to be genre-savvy.
Gus trying to distract a woman by saying he lost his cat ("Mrs. Pickles!") while Shawn snoops around in her house-pausing to eat some cupcakes along the way.
Shawn giving words to the contestants of the "Spellinng Bee".
Contestant: [in disbelief] Could you repeat that?
Shawn: Yes. Banaannaaaaa.
Shawn convinces Gus to dodge security lasers in "Extradition: British Columbia":
Shawn: Those are Canadian lasers!
In the small town of Dual Spires, none of the townspeople understand Shawn's pop culture references. Eventually, out of desperation, he asks what shows they have watched. It's revealed that the only show people watch is Everwood, so Shawn proceeds to make references to that.
The whole episode is CMOF, even for those who have never seen Twin Peaks.
"I loved Paula!" (lies down and caresses her earring while staring at it intensely)
In "Ferry Tale", when Shawn and Gus come upon the tied-up guard, Shawn announces, with portentous gravitas, "This is a prison break!", you can distinctly see the (still tied) guard make a "well duh!" expression.
After the emotionally draining events of the Season 5 Finale, Lassiter remarks about how it would take more than that to effect him. However, as he's walking down the stairs alone after this declaration, he pauses and the audience is expecting him to show some kind of reaction to all the things that has happened thus far, but he just shakes his head a little and then goes on his way. The scene then changes to Shawn and Juliet having a touching moment alone in an unused interrogation room, ending with Shawn kissing Juliet's hand... and then the camera pans out and we see that Lassiter was watching from the other side of the mirror, completely shocked, and wanders away in a daze while scratching his head with what appears to be an empty coffee mug.
In one episode, Shawn asks Henry for advice on what to do if his partner (Gus) is wrong, and he (Shawn) knows it. Henry tells Shawn to tell Gus that he's wrong, but to do so in the most respectful manner possible. Cut to much later, when Shawn confronts Gus:
Shawn: You were wrong, wrong wrong wrong! Finger guns! *points at Gus* Wrong! *makes bang sound* Wrong! *bang sound* In your weenie! *bang sound*
Gus: Shawn, put down the finger guns.
Two moments are particularly beloved by this troper. First Season 2's 'Black and Tan' and the hilarious model powerwalk down the alley. And in Season 5's 'One, maybe two ways out', where after tracking down the elusive former spy Strobinski for the second time, they have the following conversation.
Strobinski: ...could you take your shoes off? New place, [fancy name] carpets, they say its stain resistant but I don't trust them, I don't trust them at all... (Shawn and Gus begin to take off shoes), now while you're at it, in the next ten seconds why don't you tell me why you're here or else I'm gonna set you both on fire without even striking a match.
Shawn: Whoa, easy buddy...
Strobinski: Hey, I just moved in here. Come on! They've got a laundry, they've got an awesome pool! Well, it's not awesome, it's circular, you can't even swim laps in it, but it's a pool. Do you have any idea how hard it is to find a body decoy that works? This one's too fat, this one's too skinny. This guy's just right, but he's an eskimo.
All of the unnecessary powerwalks - with pumping music! - as Shawn solved the murder on stage.
In Romeo and Romeo and Juliet, where Gus steps up big time when Shawn tries to talk his way into a children's martial art class, the words coming, in his own words, faster than he could think of them.
Gus:Discrimination. And ageism...I'm his lawyer.
Owner:You brought a lawyer?
Shawn:I keep a lawyer on retainer at all times; there is so much injustice in the world you can't afford to leave the house without one.
Owner:Ok, well I will see you in court then.
Gus: Perfect. I'll need a statement from you, and since I intend to try this in both civil and criminal court, I'll need the police here as well. May I use your phone? Or do you only let the white people use that?
Owner: Who said anything about white people?...The words 'white people' did not come out of my mouth.
Gus: There they are again. Luckily I had my hand recorder on for that one. By the way, I am now disclosing this conversation is being recorded...Crazy? I sued 300 businesses last year alone. I sued a hot dog cart and got everything but the wheels and the buns, which I won in the civil case two months later...Now, before I start snapping evidence photos, I'm a little parched, can you tell me which one of these fountains I'm allowed to use?
Owner: That one (indicating adult fountain, then backtracks)
Gus getting excited when he and Shawn get to announce a vampire was the killer.
In one episode, Shawn is trying to find camera blindspots, while Gus checks the camera. Gus's entire running conversation is hilarious, particularly when Shawn mutes him to hit on the assistant curator.
Marlowe decides to help Lassiter out on a case. She does so by punching him and getting dragged away screaming. And naturally, Lassiter is so proud of his girl and more in love with her than ever. That scene probably belongs under Crowning Moment of Heartwarming and Crowning Moment of Awesome, too.
In The Shining parody episode, HEEEEEE'S LASSIE!, Lassiter chases Gus around with a Saber and tries to do the famous door hacking scene but it barely makes a hole.
Lassiter: You know, this might take a while so why don't you just open the door?
In the Season 3 episode "Six Feet Under the Sea", a local aquatic celebrity is murdered. When Shawn and Gus are in the police station after being detained for breaking into the aquarium to look for evidence, Lassie grills them for info— not realizing that the murder victim was a sea lion, not a human.
Lassie: I'm going to kill you, Spencer.
Shawn: I never told you the victim was not a sea lion.
While the episode "Mr. Yin Presents" is mostly an atypically grim episode, there is Shawn's hilariously surreal dream sequence involving Henry as an usher, Juliet as Marion Crane, and Lassiter as Mrs. Bates.
When trying to get at the body guard of Julian Drake, author of the book Feed Everyone.
Drake: You want this signed?
Shawn: Yes, please.
Drake: This isn't my book.
Shawn: Oh really? My mistake.
Drake: This is Everyone Poops.
"Lassie Jerky" is presented as Found Footage, and every shot is depicted as coming from an in-universe camera. Near the end, Shawn has one of his memory flashbacks to a tattoo on one of the bodies Gus found earlier. At the end of the episode, when it's revealed that Shawn edited together everyone's footage to make the episode, Woody compliments him for editing in part of Gus's footage from earlier for dramatic effect.
From the same episode: Lassie stepping on a beartrap and everything that follows.
Lassiter: "I will not be toyed with!" *clank*
"No Country For Old Men" is particularly funny when you consider that James Roday is part Hispanic.
In "Juliet Wears the Pantsuit," she mocks a shirt Shawn gave her that has the word "Fashion" in bold letters on the front. Later, she has all her clothes stolen...except that shirt. Finally, when the outfit she was wearing is ruined, she is forced to wear that shirt to work the next day. Everyone's reactions really sell the entire thing.
From "Shawn Rescues Darth Vader":
Gus: "That woman wears loyalty like a micro miniskirt."
Little. Boy .Cat. From Shawn's apparent Cuteness Proximity with him, to Gus's jealously over being replaced by a cat, to Shawn using the cat as lead in to present him and Gus as a gay couple,to Shawn using the cat as a "physic medium" to the bad guy being tackled by a freakin' cat. And then the call backs in later seasons particularly it was not a little boy cat.
From 2x11, There's Something About Mira, Shawn and Gus are at the batting cages. Shawn tells Gus that this guy has been following them around all day, and they decide to get his attention. Shawn picks up a ball, moves to the entrance of the batting cage, and throws it at the man; it hits the pole behind the guy and bounces off into the distance while the stranger remains oblivious. Gus scoffs and pushes Shawn aside:
Gus: Let me show you how it's done. Watch out. (He hurls the ball as hard as he can...only for it to hit the fence over the opening, ricochet over their heads, and roll into the depths of the batting cage.)
Shawn: That very well may be the most humiliating moment of your life.
Shawn names alt!Lassiter's dog "Lassiter Jr, Lassie for short."