The UFC has produced some stellar highlights over the years. From one punch walk-off KOs to standing guillotines, there has been no shortage of amazing fight-ending moments inside the octagon.The main card of UFC 261 this Saturday features a surfeit of high-level strikers. With three titles on the line, we cannot be more excited in anticipation of this PPV.There's something truly special about perfect head kicks among all KOs. Here's an ode to some of the incredible head strikes we've witnessed over the years.5 of the best head-kick knockouts in UFC history:5) Shevchenko vs EyeValentina Shevchenko will defend her flyweight belt against former strawweight champion Jessica Andrade this Saturday at UFC 261. In her first title defense, 'Bullet' put the division and the world on notice with a stunning head-kick knockout of Jessica Eye in the early seconds of the second round.The Muay Thai champion demonstrated just why she is one of the best strikers in all of MMA, not just the women's division, with this picture perfect KO.#168 | UFC 238 | June 8, 2019Eye Drops... @BulletValentina #UFC500 pic.twitter.com/2OOgsYIi4g— UFC FIGHT PASS (@UFCFightPass) November 20, 20194) Lee vs GillespieWe've figured out where Kevin Lee fits into all of this.Jokes aside, 'The Motown Phenom' suffered back-to-back losses prior to his bout against Gregor Gillespie at UFC 244. In what was a stacked card headlined by the BMF bout between Jorge Masvidal and Nate Diaz, Kevin Lee produced the knockout of the night. Edmen Shahbazyan finished Brad Tavares with a head kick that same night, but Kevin Lee's was by far the more lethal finish.What made it even more impressive was that Gregor Gillespie had an undefeated record before running into Lee's left leg. This head kick is a highlight for the ages.THE MOTOWN PHENOM IS BACKKKKK#kevinlee #ufc244live pic.twitter.com/qshfw7fQl2— Second Deck Sports (@2nddecksports) November 3, 20193) Barboza vs EtimEdson Barboza is easily one of the best strikers we've witnessed in recent times in the UFC. His spinning kicks are as accurate as any you will ever see. In his fourth UFC appearance and tenth pro MMA fight, Barboza knocked out his opponent Terry Etim with a perfect spinning head kick. Etim was out cold, and Barboza took his record to 10-0 with this finish.This one is straight out of a martial arts movie.Another amazing Kick KO is Edson Barboza vs Terry Etim at UFC 142 in Rio! #DWCOTD pic.twitter.com/dmmDKlpEA5— danawhite (@danawhite) October 5, 20152) Pete Williams vs Mark ColemanWe couldn't have made this list without mentioning the very first head-kick knockout in UFC history. Back at UFC 17 when fighters were still allowed to wear wrestling boots, Pete Williams and Mark Coleman faced off right after headbutts had been deemed illegal.Coleman was a powerhouse but was known for headbutting his opponents, and he admitted he had to learn some better striking methods after they outlawed his favorite weapon. Even if he tried to do so before this bout, it didn't help him much, as Pete Williams caught him flush with a roundhouse that knocked Coleman out cold.You're probably thinking the shoes had something to do with it; they didn't. He could have been wearing bathroom slippers and would still have the same effect. This is a combination of perfect technique and impeccable timing.Pete Williams vs Mark Coleman at UFC 17 in Mobile, Alabama on May 15, 1998. #DWCOTD pic.twitter.com/Oozu9W1BRH— danawhite (@danawhite) December 18, 20151) Buckley vs KasanganayObviously, this had to make the list. The most viral knockout of 2020 was delivered by Joaquin Buckley when he fought against Impa Kasanganay.Buckley may have lost his first fight in the UFC to Kevin Holland, but this incredible improvised knockout made him an overnight sensation. We've included the KO itself and a breakdown from Dan Hardy just because of how ridiculously good this kick is.Every angle of this Joaquin Buckley KO From last night is just insane🎥pic.twitter.com/1ZGr7y9dGH— PointsBet Sportsbook (@PointsBetUSA) October 11, 2020🏆 Joaquin Buckley v Impa Kasanganay 🏆Just outrageous. @NewMansa94 gave us the #OpenMatAwards KO of the Year.Watch the #OpenMat Award Show on YouTube 👉 https://t.co/nfanF99BWL pic.twitter.com/w02HNJyBRb— UFC on BT Sport (@btsportufc) December 28, 2020In addition to these, there have been a few other iconic head-kick finishes in UFC history, like Lyoto Machida's front-kick finish against Randy Couture and Vitor Belfort, Holly Holm's headkick KO against Ronda Rousey, Anderson Silva's front kick against Vitor Belfort, Stephen Thompson's KO of Jake Ellenberger, and Junior Dos Santos' knock out of Mark Hunt. If you haven't seen any of these, we highly recommend looking them up.Word of advice: don't blink.