I remember this from maybe 2015 on /k/. It was a youtube video of an anon wearing full camo and a balaclava, and wielding an entrenching tool showing off his skills by chopping logs and bamboo targets like a samurai.
Length was around a minute long and set to music that sounded like a metal kettle being played as an instrument. I think it had a couple thousand views total and the title was something like "still think it's useless?" or some other boast.
I've searched several times over the years but never found it.