The folks—err, folk? I can’t really tell—at Zug.com prove in a recent prank that signature lines on credit cards are virtually useless as security devices. Okay, okay, so it’s not a controversial position but the way they proved it makes for a good read.
While you’re there, check out some other pranks like the Printer Pranks series, the Prank Software, Good Office Pranks, and the Good Computer Pranks.
I’m definitely going to have to keep an eye on that site!