"Ninjas descended from the sky to offer him a job during his breakfast, and this was Fred's response, in its entirety: 'ME, A NINJA? OKAY.' Which brings me to my next two points. First, "ME, A NINJA? OKAY," is my new philosophy on life. And second, Fred is way, way too stupid for Barney to be doing this for fun. There is no sport in tricking a person this gullible. In one commercial, Barney simply puts on a Run-D.M.C. hat and barges into Fred's home, rapping. Barney has the same face, voice, and a-line dress of Fred's friend of many years and the man's first question is still, 'WHO ARE YOU!?'"
"Anthony Ainley’s Master, who here becomes nearly impossible to take seriously, gets abandoned in it....Whatever one might say of the idiotic Kallid revelation in Time-Flight, at least the makeup Ainley was wearing that time around successfully obscured his identity. This time you have someone who is obviously Anthony Ainley gone ginger doing an appalling French accent. Never mind the theme of returning villains in this season. Between this, Michael Gough, and Mawdryn’s rather spectacularly poor Doctor impression the theme of the season is, at this point, utterly rubbish revelations of the secret villain."
Chris: Lex Luthor — in the grand tradition of Gus Gorman — dresses up like a general and this is apparently enough to get the world’s most wanted criminal onto the site of a “nucular” missile launch.
David: I wonder if this is how General Zod got the job. I mean, it’s worked twice on Earth now.
"The goofy teeth seem familiar, but the tiara has me baffled!"
— Doctor Bender, The Fairly OddParents.
"My name is Beast Babe." (giggles)
— Beast Boy, Teen Titans Go!
Doofenshmirtz: A banjo-playing platypus?
Perry dons his hat
Doofenshmirtz: PERRY the banjo-playing platypus?!
Mr. Furious: That's because Lance Hunt is Captain Amazing.
Blue Raja: Oh here we go...
Shoveler: Oh, don't start that again! Lance Hunt wears glasses. Captain Amazing doesn't wear glasses.
Mr. Furious: He takes them off when he transforms.
Shoveler: That doesn't make any sense. He wouldn't be able to see!
— Mystery Men
Banjo: I'm Banjo the Stony. Can I come in and play?
Officer Unogopaz: Hmm... I don't know. That backpack looks kinda familiar...
Kazooie: Are you saying we're a bear and a bird in an elaborate disguise, trying to cheat our way in?
Officer Unogopaz: Yep, it's pretty obvious.
"You wear a disguise
to look like human
but you're not a man
You're a Chicken, Boo"
(After having fallen for one of the Beagle Boys disguised as a woman)
"Great Flaming Catfish Whiskers! The Beagle Boys! The moustache shoulda tipped me off! I need to get out more!''"
— Scrooge McDuck, Master of the Mississippi
Darkwing: Hold the phone. You're not Megavolt; you're Tuskerninni, in a really bad Megavolt disguise.
Tuskerninni: I am not Tuskerninni, and this is an excellent disguise!
— Darkwing Duck, "Adopt-a-Con"
"Aw, gee! These disguises don't fool nobody!"
— Bebop, Teenage Mutant Ninja Turtles
(Steve appears, wearing a Shy Guy mask.)
Steve: Hi guys! Can I join you guys? Huh? Huh?
Shy Guy: Hmmm... you look about right. What's your name?
Steve: Steve... Oh no, I mean Shy Guy!
Shy Guy: Well then... welcome, brother!
—Bowser's Kingdom episode 2
My God! You mean the blonde woman with the German accent is actually the blonde woman with the German accent?
"Villains always fall for cheesy disguises."
— Bugs Bunny (briefly poorly disguised as Taz), explaining to Buster and Babs a few basic facts about being a cartoon character, Tiny Toon Adventures
(Antimony approaches door, wearing a headband with attached antennae.)
Antimony: Hello. I would like to enter, please.
Doorbot: Robots onl... what's that on your head?
Antimony: These are my antennas, because I am clearly a robot.
Doorbot: Oh! Well... it's true that some robots have antennas... hmm...
Antimony: Also, robots never lie.
Doorbot: Hey, you're right! Come on in, friends!
The three escapees continued making progress, slowed only a few times when they were spotted by ninjas, all of whom held brief discussions of questionable logical validity before agreeing that the three couldn't possibly be who they very obviously were.
"There, you see? Count Olaf has one eyebrow. Coach Gengis has a turban. They look nothing alike."
— Vice Principal Nero, The Austere Academy
Bart: There's something different about you.
Homer's German Doppelganger: I am a new tie vearink.
Bart: Oh yeah.
Luna: "I thought you were just playing along! How could you be fooled by a pair of glasses!?"
Zacharie (wearing a crude cat mask): "Good day, dear reckless accomplice! I've somewhat changed, anatomically speaking...But you have obviously recognized me at first glance! I'm your friend, the Judge!"
Zacharie: "...So my disguise is no match for your keen and unforgiving eyesight..."
The Princess: "Aladdin!"(empresses him)
Aladdin(disguised as Prince Ali): "How the fuck'd you know it was me?"
The Princess: "Because it is you! You're just wearing different clothes."