Every time I sign a credit-card receipt, I wonder what the point is. I don’t recall any clerk ever checking to see whether it matched the signature on the back of the card. Apparently I’m not the only who’s wondered. Old Ziff-mate John Hargrave’s Credit Card Prank is the ultimate real-world proof that credit card signatures are worth even less than you think they are.
Update: I realize now that the prank linked to above is actually just the first chapter of the prank I really meant to link to, which is bigger and funnier.