In fact, Kenshiro is so badass that the Mook's face mask was already smashed! It's also why the mook's head exploded instead of Kenshiro's; Kenshiro elbowed a Pressure Point in his face that set up a hilariously timed delayed reaction.
His original counterpart in the manga was at the receiving end of the Zankai-Ken. Kenshiro then puts the poor sap in the hole with only his thumbs.
From the same episode, Ken burying the saw (which he'd just been given and ordered to cut a guy's head off with) into the Mook's head.
-"Yes... But not on me..."
When Rei does this in the 1986 film, the mook experimentally taps the saw now buried in his head. Giggle fuel!
Mook: Nah, I was talkin' about the other guy.
Rei: Silly me, what a foolish mistake.
Mook: I got a splitting headache...
Rei: Oh? *Moves the saw a bit, killing the poor guy.* Better now?
The Humiliation Conga that Jyuza dealt to Raoh and his army. Outsmarting Raoh with a fighting style he literally just made up, stealing Raoh's horse and just to rub salt in the wounds, Jyuza slaps his own ass telling Raoh that he can "kiss his ass".
Kenshiro shoved one poor miniboss into a cannon, then shot it through a hot air balloon, then exploded when he landed (the scene is 9:10 minutes into the video). Speaking of that, Nanto Human Cannon technique does not look like it is a serious technique, but just some ridiculous child's trick playing the name of Nanto already.
Also, as mentioned in Crowning Moment of Awesome, Kenshiro blowing up the tank!
"You call throwing dynamite around a martial art?" "Hey, as long as it works!"
Any time one sees Rei cutting, slicing, cubing or julienning a mook, it is to giggle madly. Especially since this is usually accompanied by a helpful TV split-screen effect that we see is not an effect at all.
Sometimes, he ends up swiping them so fast that the momentum actually causes the pieces to swap to the next guy over. In sequence.
While first taking on the Fang Clan, Kenshiro finds the selfish Rei about to battle a pack of mooks at the bottom of the cliff. As Rei and the bandits exchange boasts, the scene cuts to Kenshiro slouching over a corpse right next to one of them. Kenshiro then stands up and asks Rei what the heck he's doing there. The two men connect over their shared hatred of people who bring harm to women, completely ignoring the dozens of warriors surrounding them. A Mook Horror Show comes afterwards, featuring Rei slashing and dicing while Kenshiro explodes people by kicking, poking and grabbing their faces. The last bandit standing then receives not a Hundred, but a Thousand-fist barrage. To cap it off, we get this exchange:
Kenshiro: You'll be dead in 5 seconds!
Mook: No... No way! 5 seconds is too... *Gets chopped*
Rei: Then die now!
[The pieces of the mook fall to the ground and thenexplode as Kenshiro and Rei walk into the night]
In a non combat sequence in the anime, Ken, Rei and Mamiya are making their way to the Fang Clan's hideout. Mamiya has some difficulty climbing up the mountains, prompting Rei to offer his hand, remarking that this is why he wanted Mamiya to stay behind. This remark makes Mamiya pull out a combat needle, jab in the general direction of Rei's hand and pierce it into the rock to use as climbing leverage. As Mamiya brushes off and goes to the front of the line, Rei and Ken both look at her, and then at each other, cracking a smile. Possibly admiring Mamiya's pluck.
Kenshiro's climactic battle with Boss Fang, who is using the Hua Steel Armor technique to make his skin like steel, comes to an abrupt halt as Kenshiro strikes a pressure point that returns Boss Fang's skin to normal, then bashing him with a rusty I-beam. The first two blows are positively brutal, but the comedy comes from the resulting image of a giant, muscular, fur-clad barbarian king cowering and shrieking as Kenshiro beats him repeatedly with an iron girder that otherwise seems to have all the impact of a foam pool noodle. The capper is when Boss Fang proves to be a Dirty Coward and throws one of his many sons at Kenshiro to try and hold him off. Kenshiro responds by holding up the steel beam so that the Fang Clan mook runs facefirst into it, then casually drops the beam onto the mook after he falls off it. It's an oddly cartoonish moment in an otherwise serious fight.
An earlier match with the fang clan is also pretty funny. Right from the moment Kenshiro hits their leader in the eyes with a pair of food cans.
The French Dub is a source of many funny moments:
This one kinda falls under both Black Comedy and Crosses the Line Twice: instead of committing suicide, Yuria apparently falls of Shin's palace by accident, because he didn't instal the railings yet. Shin then responds, "Bring me the architect; it's his fault she died!"
A member of the Fang Clan claims another member's telescope is broken, when it works just fine.
There's also this exchange between Shin and another Mook during the failed uprising in Episode 21:
Mook: "I will slice your head just like Salami! What's happening?"
Shin: "You wanted to show me your secret technique, imbecile, and now you're talking about Salami?! Bring it on! You're gonna know another one! Look! The best against toothaches."
One of the moments in Episode 19's second half turns Kenshiro into a total savage:
Civilian: The Man with the Seven Scars...
Kenshiro: Yes it's me and are you the man with Seven Knives?
Ken defeats Warden Uighur's whip attack, sending the warden's whips back into his face... tied up in a bow.
Raoh's lieutenant Galf uses his loyal dog Seki to decide the fate of his victims. However, when struck by Kenshiro, Galf tries to get Seki to stand by him as he's about to die. Seki sensing that things are about to get messy, flat out pisses on Galf and abandons him.
Shin is very rarely shown fighting anyone. When he starts slicing people with his Nanto Seiken techniques, his deep voice becomes replaced with a high pitched battle cry akin to the squawking of a bird.
In Ten no Haoh, when Raoh and his entourage make their way into the king's palace so that Raoh can kill him and take over, they're masquerading as entertainers with Raoh as the koto player. When asked to play the koto, he responds while not having a facial expression: "I will play the koto!" *smashes the koto on a pillar* "I cannot play the koto!"
When Kenshiro confronts Alf, Ken makes light of him by asking who he's supposed to fight against. The only other guy in the room is a 'useless mook' (Who is actually Shachi in disguise), so Alf is greatly offended.
The English dub of the 1986 anime movie has some hilarious dialogue, such as this Pre-Mortem One-Liner to Mr. Heart.
Ken: Say your goodbyes, lardass, because you're already dead!