How do you get a knife from basic materials when you are at a hotel and just want a peanut and jelly sandwich? Say you are in a foreign hotel. You couldn't carry a knife since you went through security. And hotels want you to buy a restaurant meal so there's nothing close not even tea spoons in most hotels.
You could go to corner stores but you can't buy a single plastic knife.
So here's a simple way.
Go to a local market and buy a set of plastic cups.
Plastic cups come in two varieties. Soft ones and hard ones.
For Hard ones, shatter the plastic cup bottom and then peel away one side for the knife. You can bend it back and forth to make a sharp edge where you want it.
For Soft plastic cups, you bend the top rim so it has a crease, then take a pen and jab the side of the cup. That will open the plastic and it will tear along the fibres. Remove the bottom of the cup from the sides. For softer cups I would tear a larger sheet of plastic and fold it in half for more strength.
Now you can make that peanut butter sandwich on the cheap!
