Video of a Katana Slicing a Paper Carton Sparks ‘Anyone Could Do That’ Reactions

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A thread on 5ch shared a video of someone slowly test-cutting a paper carton with a Japanese sword (katana). While some viewers were struck by how the blade was worked in with small, repeated motions instead of one swift slash, others gave a cooler response — “anyone could do that,” “even a kitchen knife could manage it” — sparking debate over just how sharp the blade really was.

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Not what I expected

Source: video.twimg.com / original post here

2Anonymous2026/08/23(日) 22:32:00.97
Wait, isn't it supposed to be one quick slash?!
5Anonymous2026/08/23(日) 22:32:45.37
For a second I thought there was coffee inside it
8Anonymous2026/08/23(日) 22:34:53.98
He's trying to look cool but he really isn't lol
9Anonymous2026/08/23(日) 22:35:22.84
Reminds me of Bucciarati getting punched (the famous 'gets beaten up' scene from JoJo's Bizarre Adventure)
14Anonymous2026/08/23(日) 22:37:58.39
>>9
The pain hits you in slow motion, delayed lol
11Anonymous2026/08/23(日) 22:36:27.87
Still, cutting through an empty, unsecured carton without knocking it over might actually show insane sharpness
13Anonymous2026/08/23(日) 22:37:41.12
Some slacker old man scraping by doing street performances
16Anonymous2026/08/23(日) 22:39:15.88
I thought he was just holding his stance the whole time, but he'd already cut it lol
17Anonymous2026/08/23(日) 22:39:33.77
Kind of like those old warrior legends where a dragonfly lands on the blade and just splits in two on its own — does that kind of thing actually happen?
19Anonymous2026/08/23(日) 22:40:44.07
He's sawing it in with terrifyingly tiny little motions
Only someone as sharp-eyed as me would even catch that
20Anonymous2026/08/23(日) 22:43:04.96
This is the thing people do before and after sharpening a kitchen knife
21Anonymous2026/08/23(日) 22:43:16.57
Wait, he's doing it slowly?! lolololol
22Anonymous2026/08/23(日) 22:43:48.77
Before I knew it, it was already cut clean in half
25Anonymous2026/08/23(日) 22:44:43.50
Well, it's not easy, but a katana's edge should manage at least this much
27Anonymous2026/08/23(日) 22:45:19.04
Cutting it slowly is actually the harder part, but this isn't really what I wanted to see
28Anonymous2026/08/23(日) 22:45:40.49
Anyone could do this lol
45Anonymous2026/08/23(日) 23:02:37.58
>>28
Seems doable once you get the knack for it lol
29Anonymous2026/08/23(日) 22:45:46.05
If this were an iaido quick-draw, you guys would just complain it's too fast to see
31Anonymous2026/08/23(日) 22:46:57.32
Videos of sword draws too fast for the camera to catch show up now and then
34Anonymous2026/08/23(日) 22:48:27.97
I used to love those old Katori Shinto-ryu (a classical Japanese swordsmanship school) videos on Niconico, watched them over and over
36Anonymous2026/08/23(日) 22:49:38.25
I thought I was going to see some inhuman, otherworldly technique like Kogan-ryu (the brutal fictional sword style from the manga Vagabond)…
37Anonymous2026/08/23(日) 22:50:50.63
Cutting it slowly is actually the impressive part
There's no way I could ever pull that off
39Anonymous2026/08/23(日) 22:51:53.71
Some people are saying it's just moving under the sword's own weight
41Anonymous2026/08/23(日) 22:53:50.97
Deep down he's probably just dying to cut an actual person
43Anonymous2026/08/23(日) 23:00:07.23
I was expecting him to cut a small slit at the spout
47Anonymous2026/08/23(日) 23:04:45.36
Turns out there's no real back-and-forth sawing going on
49Anonymous2026/08/23(日) 23:17:17.48
There are similar videos out there for sharpening kitchen knives
51Anonymous2026/08/23(日) 23:25:05.38
He's just adjusting where he applies force so it doesn't tip over
53Anonymous2026/08/23(日) 23:32:55.09
Does a katana only show its true sharpness in the hands of a master?
I wonder if every samurai back in the day had the skill to bring that out
55Anonymous2026/08/23(日) 23:35:08.46
They say you have to draw the blade to cut
Well, that's true for paper anyway
56Anonymous2026/08/23(日) 23:35:43.51
In real combat it was probably more thrusting than slashing
57Anonymous2026/08/23(日) 23:42:58.14
Apparently it was more like beating people to death than cutting them
Like clubbing them with something more like an iron rod
58Anonymous2026/08/23(日) 23:43:25.53
Lol, but wait — could this actually be an AI-generated video?
62Anonymous2026/08/23(日) 23:48:05.67
I wonder what would happen with an OLFA box cutter (a popular Japanese utility knife brand)
63Anonymous2026/08/23(日) 23:49:02.81
Being able to cut it slowly without knocking over a light, empty carton is probably the impressive part
64Anonymous2026/08/23(日) 23:49:23.93
No way a kitchen knife could do that
Just think about it for a second
65Anonymous2026/08/23(日) 23:50:15.04
I have cut a worthless thing again (the famous line from Rurouni Kenshin)

*This article is excerpted and summarized from the 5ch (Hello! Project) thread “[Video] A Katana Test-Cut Slicing a Paper Carton in One Stroke Is Insanely Impressive!!!!!!!!!!!“.

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