The next day I need to cut a piece of string and Dammit! where's my knife?!! Oh yeah.
My society in an orgy of panic needs it for self-inflicted injuries.
So like any good tool-using ape, I grab whatever knife is handy, rub it on something til it's sharp, and when I'm done opening the letter or whatever, I roll the blade up in a piece of paper, fold the end over, and pretend it's a pocket knife.
Take that, you unelected King George! The founding fathers and I despise your Tyranny!
Photos by Fungusamungus