From the Dept. of Making-Knives-Out-of-Oddball-Things, aka kiwami japan, comes the "sharpest Cardboard kitchen knife in the world," one made from an ordinary Amazon box. It chops, it dices, it slices!
We've seen kiwami japan make sharp instruments from such things as dried fish, wood, and aluminum foil. Now, the YouTuber is using green gelatin as the medium to make "the sharpest jello kitchen knife in the world." Because, sure, why not?
(I can't be the only one who was reminded of this early 1990s hit by Green Jell-O, I mean Green Jellÿ.)
Katsuobushi (aka bonito) is dried, fermented and smoked tuna and it's incredibly hard. It's so hard that it's possible to fashion a shiv out of it.
To do so, you'll need a mandoline, an adjustable wrench, a metal file, a vise to hold it in, an oven, a whetstone and some patience. YouTuber kiwami japan shows the way.
You'll not only get a dangerous weapon out of the deal but also a big bag of bonito flakes (which are great for making your food look like it's moving).