Why you little!

"Why you little!" is one of Homer's catchphrases. Most of the time, it is traditionally followed by Homer strangling Bart for whatever reason, commonly being Bart insulting Homer verbally, but in the episode Homer's Phobia, Bart slapped Homer on account of seeing people hitting each other. Homer doesn't strangle Bart because he is too far away, and another time, Homer strangles Bart for no reason. On this occasion, the catchphrase is echoed (“Mona Leaves-a”). Another time, Homer eats a fire stick and tries to burn Bart while strangling him (“Father Knows Worst”). In some episodes, Homer doesn't say Why, you little! before strangling Bart, but instead says something different (i.e, in Blood Feud, when Homer learns Bart already mailed his letter to Mr Burns, he says I'll show you mad in the morning! before choking Bart.

Variations
A count of 19 variations was heard on television/mentioned in comics. These uses often differed because the phrase would change to suit the current situation.
 * "Why, you little! I'll teach you to laugh at something funny!"/"Why you little! I'll strangle-angle you!" (The Simpsons Movie)
 * "Don't tell me I'm not capable of good behavior!" (Donnie Fatso)
 * "Why you metal..........!" (Used for Bart's replacement robot David in "Treehouse of Horror XVI")
 * "Why you little...! Hmm, free wig eh?" (Homer says this after Bart tricked him into getting a coupon for a free wig under the pretense of getting tickets for a game, being about to strangle Bart for the prank, but then gets the idea to actually GET a wig modeled after Marge to use for himself as a means to mimic her enough to not need her anymore and ignoring Bart afterward in "Homer Loves Flanders").
 * "Why, you little Borderline psyco-" (Said by B.F. Sherwood in Family Therapy [this is the first variation])
 * "Why you cotton-pickin'!!!!!!!!!!!!!" (Used for Cletus in "Home Sweet Homediddly-Dum-Doodily")
 * "Choke on your candor!" (Used on Bart after he makes fun of him being attacked by a gri zzly bear in "The Fat and the Furriest")
 * "Well, take note of this!!" (before strangling Bart, believing that he has cheated on his history test, though he later finds out that he didn't in "Sleeping with the Enemy")
 * "Why, thee little!" (The pilgrim portrayals of Homer and Bart employed this gag in "The Wettest Stories Ever Told")
 * "Pretend to care!" (while strangling Bart in "She Used To Be My Girl")
 * "Why you little bastard......!" (after Lisa points out that there are two types of bastard; it should be noted that while Homer is strangling Bart she comments, "That's the angry one." in "Wedding for Disaster")
 * "WHY! YOU! LITTLE! Burn, baby burn! (roar)! (After Bart pranked Homer, after the latter stupidly ingested a flaming torch thinking it was a "fire kabob", by tricking him into ingesting gasoline when he needed water, proceeded to shout his catchphrase while consequently breathing fire while trying to pursue Bart, and upon getting him into a stranglehold, proceeds to spray fire at his face in "Father Knows Worst")
 * "Why, you big...!" (Marge says this as she enters a two-way "why you little!" by strangling Homer who was himself about to do so with the gag's traditional victim in "Homer's Night Out". Blossom also says this when she strangles Mojo Jojo in the Powerpuff Girls' story in Boogie Frights.)
 * "You stole my money!" (Bart says this as he attempts to reverse the roles in Barting Over. Bart's hands are too small so he pulls Homer's belt off and uses it as a Homer-strangler instead.)
 * "I paid for your splendor!" (Homer to Bart in Barting Over after seeing Bart's new home and that half of his paycheck went to Bart in him settling in on his new luxuries.)
 * "I'll Kwanzaa you!" (Homer after Bart demands Homer's mother, Mona, give him several years worth of holiday money in "Mother Simpson".)
 * "I'll audience you! (after Bart tells him that he lost his stranglehold on the audience in his show in "Today, I Am a Clown".)
 * "Choke on your lies!" (when Bart tells Homer he did not make a prank call to Brazil in "Blame It on Lisa".)
 * "Die, monster!" (when realizing Bart made the Angry Dad cartoons and humiliated him in "I Am Furious (Yellow)")
 * "Just run the the camera, you little--!" (when Bart is filming Homer's speech to Marge that he is leaving her because she is going out with Artie Ziff and says "Patty and Selma?! Screw that!" in "Half-Decent Proposal")
 * "Why, you very little--" (strangling Bart in a video on "The Girl Who Slept Too Little")
 * "Boy - must - die!" (when Bart spills the lotion that makes hair grow in "Simpson and Delilah")
 * "I'll show you mad in the morning!" (when Homer realizes that Bart mailed the letter, but Marge scolds him, "Homer, you encouraged him. You should be strangling yourself!" in Blood Feud )
 * "Why, you little! I'll teach you to have a libido!" (Strangling Bart as Homer catches him and Milhouse watching softer-than-soft-porn on the Internet I.E. Flanders' 2 female tenants transmitting slightly naughty live webcam shows (no nudity though!) from inside Flanders' own house in "Home away from Homer")
 * "YOU!! You did this to me!" (when Homer realizes that Bart turned his shirt pink in Stark Raving Dad)
 * "Why you monster! And you took my daughter's saxophone too! (Homer's rage at the cat burglar directed at the Channel 6 stage manager in Homer the Vigilante)
 * "Choke on my numb, blue hands!" (Homer attempting to strangle Bart with frozen hands in A Totally Fun Thing That Bart Will Never Do Again)
 * Why you slimy little! (Homer on snail Bart in Married to the Blob)
 * Why you little! I'll show you who's a flabbi! (Homer rolls Bart's face on his big stomach in Clown in the Dumps)
 * He what? You monster! (Homer says this in Angry Dad: The Movie. Blossom also says this to Bart before strangling him at the end of in Boogie Frights.)
 * "Why you Little! I'll give you a good night kiss you won't soon forget! Grr! Come here, you!" (Rubs Bart's face with his facial hair (Labor pains))