I think it would be a good idea if there was a way to let another player know that you are really upset with them. There are a lot of options to interact with fellow players, (i.e. Kiss Hug Moon Splank) but I think Glitch could go one step further and add a Shank option.
In terms of etiquette, it would be a much more extreme version of splanking, when someone has truly crossed the line. Perhaps you could perform this action when you want to block a player, and let the good for nothing know you did it, and you are quite serious, and not to be messed with. This way, once the player has been shanked, they will disappear.
I think you could make a pretty good Shiv by combining the head of a broken pickaxe, and the handle of a broken scraper. Perhaps you could craft this new item by combining these two existing broken items. I'm not sure from a gameplay sense if you should create the shiv and keep it as a tool, or equip it to your bear, much like lips or the moon.
Personally I think you should be able to equip it to your bear, because it will take some of the sting away from the act, from the shankee's perspective. If you've been shanked by someone and your screen is filled with a shiv stabbing you, you might be really upset, maybe even slightly terrified. But if that shiv was in the hands of an adorable little bear, you might be really upset, maybe even slightly terrified, but then laugh just a little bit because you just got shanked by an adorable bear. Maybe he can wink at you, right at the end, as if to tell the player, "Hey buddy, I think you need a bit of an attitude adjustment, but I'm only shanking you all in good fun."
In conclusion, in order to let us, as players, express our emotions across a wider spectrum than that currently available, Tiny Speck should let us craft shivs in order to shank other players, possibly at the hands of adorable little bears.
Your thoughts?