* The episode "The Laughing Bat" where the Joker decides to become Batman. Just the general description is hilarious and watching as the Joker acts like Batman for the entire episode just puts a smile on your face.
** When Joker-as-Batman shows up to foil his crime, Penguin gets ticked off.
--->"Are you out of your gourd? You don't see me barging in on your 'gas all of Gotham' schemes, do you? It is called professional courtesy!"
*** It gets better; when Joker says he'll get a huge bounty for taking down Gotham's second biggest criminal, Penguin gets very indignant.
**** It gets even BETTER when ''Batman'' shows up, while under the effects of Joker Venom.
-->'''Bat-Joker:''' Joker!
-->'''Penguin:''' ''Batman?!''
-->'''Batman:''' (''laughs'') If it isn't... Dumb, and ''Dumber''. (''laughs even harder'')
-->'''Penguin:''' ...Okay, now you two are starting to creep me out!
* "There was a slight misprint on your invitations, sir. You are apparently hosting 'a farty'" (Alfred's [[DeadpanSnarker completely deadpan delivery]] is what makes it so damn funny).
* Batman has summoned his Batbot mech suit to take on a Venom-enhanced Joker. He's knocked out before he can get inside, so Batgirl does it instead. Batman awakes a few minutes later to see the battle, and says "She '''''didn't'''''." in a hilarious tone of chagrin and disbelief.
** Later in the same episode, a MiniMecha walking around like it's drunk.
* Penguin is afraid of the mysterious Rumor that's been kidnapping all the supervillains in Gotham, so he's decided to turn himself over to Batman. So desperate is he to get caught that he resorts to the most cliched villain dialogue in the book.
-->'''Penguin:''' What I want is to turn myself in! Come on, chop chop! Let's go, pat me down! ([[{{Beat}} Silence]]. Batman and Robin look at each other.) Have to catch me in the act, is that it? Okay, look! (Takes a painting off the wall) I'm stealing! (Batman, Robin, and Catwoman blankly stare at each other) What? Not enough? (Halfheartedly wields his umbrella) Then you should know that soon all of Gotham will suffer some cruel, ironic, bird-related fate at the hands of El Penguino! (Catwoman rubs her temple and shakes her head) What's a felon gotta pull to get arrested around here?
-->'''Robin:''' Uh, you're embarrassing yourself.
** Later on in that episode, after Rumor has captured the entire Rouge's Gallery with the intent of finishing them all off, Hugo Strange decides to ask him what is his motivation for all of this is. We then get this exchange:
-->'''Rumor:''' "Why"? I'll tell you why. (''removes his mask'') [[spoiler: I'm the bodyguard of Paul Karon. A great man. A man ''you'', Joker, maimed.]]
-->'''[[spoiler: [[SelfDemonstrating/TheJoker Joker:]]]]''' (''points to himself and smiles'') Me?
-->'''Catwoman:''' (''FacePalm'') Should've ''known'' this was ''[[spoiler: Joker's]]'' fault.
-->'''Penguin:''' Just ''had'' to make the nut-ball angry!
* A lot of Robin and Batgirl moments turn into this. For example, when they're bored on stakeout duty:
-->'''Batgirl:''' ...Eaten by a crow.
-->'''Robin:''' I think he fell on a spoon.
-->''(Viewpoint switches. They're staring at a wanted poster of a man with an eyepatch)''
-->'''Batgirl:''' Nah, I bet he's not even missing an eye. He just thinks eyepatches are cool.
** And then they debate over scones while Alfred tinkers in the background.
--->'''Robin:''' Anyone we know could be a robot!
--->'''Batgirl:''' Oh, it wouldn't fool us if we knew the person. ...Would it?
--->'''Robin:''' Maybe not. They'd probably be a little robot-y... detached... unemotional... mechanical...
--->''(Both of them turn to look at Alfred)''
--->'''Batgirl:''' ...Kick his head off.
--->'''Robin:''' ''You'' kick his head off.
--->'''Alfred:''' Attempt to do any such thing, and I assure you, there will be no hot buttered raisin scones for either of you for a year.
--->'''Robin:''' ...Only Alfred sounds that much like Alfred.
--->'''Batgirl:''' Yup.
* This little exchange from Harley Quinn's debut episode, ''Two of a Kind'':
-->'''Harley:''' But what if...
-->'''Joker:''' [[MotorMouth You'reseenassociatedwithacertifiedcriminalwhackjooob?]]
* Robin's fighting an evil duplicate, who's copying everything he's saying:
-->'''Robin''': I like to smell my feet.
-->'''Duplicate''': You like to smell your feet?
-->'''Robin''': Walked right into that one.
* When Green Arrow meets Alfred in the Batcave:
--> Green Arrow: Haven't I seen you before?
--> Alfred: Perhaps at the Renaissance Fair?
* In the episode featuring Harley Quinn's StartOfDarkness:
--> '''Joker''': You've got moxie! *ominous organ music with a {{Beat}}* I feed moxie to the hyenas.
--> ''*Joker whistles as a pair of vicious, snarling hyenas leap out and prepare to maul Harleen*''
--> ''*Harleen steps back a bit in fear, then frowns...and then...*''
--> '''Harleen''': [[ScareTheDog SIT!!!!]]
--> ''*The two hyenas do just that*''
--> '''Joker''': You're good.
** From the same episode, when Harley sics Jokers hyenas on the TV crew.
---> '''Harley''': So, you didn't like my show? Well, try this one. "When Animals Attack People I HATE!" (beat) It's a comedy!
** Earlier in the episode, while Joker is watching Harley's show, he states his personal opinion on it:
---> '''Joker:''' Pop Psychology at its worst! That girl's theories are unfounded, her professional manner's a joke, and her training, if ANY, is shoddy at best! ''({{Beat}})'' I ''LOVE'' THIS SHOW! The girl's more ''screw-loose'' than ''ME!''
* In "Cash For Toys", Cash is sleepily walking through the house in the middle of the night when Alfred takes the elevator up from the Batcave and gets caught.
-->'''Alfred''': Um...occupied?
-->'''Cash''' (stares sleepily): Sorry. (Stumbles on)
* The Penguin with Green Lantern's power ring. Enough said.
** From that same episode, this exchange between Bruce and Dick while they're at a charity event:
-->'''Bruce:''' Having fun?
-->'''[[DeadpanSnarker Dick:]]''' [[SarcasmMode Tons]]. And I just figured out why The Joker is such a nutjob. (''[[StepfordSmiler gives a big fake smile]]'') Because [[PerpetualSmiler this much smiling]] drives you ''crazy''!
* "A Fistful of Felt" has quite a few, such as Scarface's thug Rhino having to disguise himself as a goofy-looking smiling flower and Scarface (disguised as Mr. Snoots, a replacement puppet that was given to the Ventriloquist) threatening to destroy a kid [[DisproportionateRetribution because he asked him for a hug]].
** Scarface and Mr. Snoots fighting. Enough said.
* "Let the kid go, Joker." "I'm '''''TRYING''''' to!"
* Batman punches an old lady florist. [[spoiler: Actually, it's one of Poison Ivy's PlantPerson guards defending the warehouse.]] Batgirl wonders if Batman knew who she was before attacking.
* When Joker wakes up in a hospital bed:
-->'''Joker:''' Medical report! STAT!
-->'''Doctor:''' Y-you had a... b-bad accident. Y-you're a very sick man.
-->'''Joker:''' ''Flattery won't save you!''
* In ''The Metalface of Comedy'', when Joker first meets his double, [[EvilTwin Joker 2.0]] [[ItMakesSenseInContext (who is made completely out of self-replicating nanobots)]], Joker 2.0 literally ''[[EyeScream pulls his own eyes right out of their sockets]]'' just for the heck of it. What makes it funny is [[{{Squick}} Joker's reaction]].
-->'''Joker 2.0:''' (''gasps, [[EyeScream pulls out his eyeballs]], and holds them out right in Joker's face'') Am I really that ruggedly handsome? Peekaboo! (''laughs as he puts his eyes back into their sockets'')
-->'''Joker''': (''turns away with a [[{{Squick}} visibly grossed-out look]] on his face'') Ugh...