toilet paper is a strange one... it's very bulky so it takes up lots of room on the shelf, and it also stands out in a cart... usually sitting on top of the cart because it's so light but large.

everyone thinks "i better get some shit paper just in case", everyone starts buying one pack... then suddenly everyone sees everyone with TP, and they see the shelves are running out fast (far fewer units sold for that shelf to be empty than any other shelf in the store).

psychology kicks in, people start grabbing two packs because everyone else is grabbing one so why not... which makes it all worse and eventually you get fat old people fighting over still shrink wrapped pallets as they are dropped in the center isle... people filling trucks with it... people selling it for inflated costs in the parking lot after they buy everything out...

real classy behaviour and it only takes less than an hour or so to watch this happen.