I ran across this great experiment Kingpin tried testing how far one could go not signing your signature properly when making credit card purchases. He’s definitely proven a point and made a hilarious experience. A must read I must say.
As I distribute my card, the most common question I run into is
"what does MySQL AB do?"
My answer is usually something like "we allow you to store a lot of information and process it efficiently."
But I've been thinking a bit, and perhaps a better quip might be "you know what the Central Intelligence Agency is, right? Well, we are the most popular database system used by the Decentralized Intelligence Agency, as it were."