Every time someone uses a credit card to pay for a purchase at work, I have to ask to see the card to approve the signature. But very quickly, I learned that asking for the card doesn't help with the task, and most of the time I also need a driver's license. The reason I need that identification? People don't sign their cards, apparently to prevent thieves from being able to copy their signature after stealing the card. I find it hilariously disturbing that they don't realize that leaving that space blank means that they don't need to go to the trouble of copying the signature, they can just make one up themselves.
So please, if you don't want to sign your card, I understand. But for the love of credit theft, put 'Check ID' in that blank space. That way whoever has your wallet has to go to a lot more trouble to have a spree at the mall.
There, I feel better now.