h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

"To protect ourselves from criminal action we need to know if you are over twenty-one before letting you enter this site. The quickest way to be sure of this is to ask you to give us your credit card details, as credit cards are not issued to minors.

"Please enter your credit card details in the form underneath. We will check that this is a valid credit card number. These will be stored securely by us and will be used for no other purpose than to verify that you are over twenty-one"

Oh, yeah?

I've seen this or a variation of the theme on one or two websites aand I'm usually awake enough to get out as fast as possible...

but out there, there just MAY be the scam which is so plausible that I'll fall for it. This worries me, esp as the first time I encountered the above scam, I gave it house room in the "real" box for longer than I should...