So, when you make a half peanut butter and jelly sandwich, you put the peanut butter on one side and the jelly on the other. Am I right? Okay so, if you try a full peanut butter and jelly sandwich this way, you get a half double peanut butter half double jelly sandwich. And if you rotate one piece 90 degrees, you get a quarter peanut butter and jelly, quarter jelly and peanut butter, quarter jelly-jelly, quarter peanut butter peanut butter sandwich. And then if you rotate that piece another 90 degrees, you get a half peanut butter and jelly and half jelly and peanut butter sandwich. That is a peanut butter and jelly punnett square. ...And see, that's what I just did while I was supposed to be doing my English essay.
I'm so using this for extra credit on my Anthropology exam. Btw, someone taught me instead to take a chunk of peanut butter and a chunk of jelly, mix them in a bowl and then put it on the bread.