Silly

Owna credit card? Notice that when you make a transaction with your card, the clerks don't even check whether your signature on the receipt is similar to your signature on the card? Do they even care? What's the point of me giving signature on the card, anyway?

This guy scribbles his receipts with weird images.
Next time I bought something that required a signature, I considered just creating a rectangle of solid black. Then I thought a grid might be weirder.