For the record, I tried using a re-captcha plugin overnight, which cut down registrations significantly, but there were still quite a few.
"Some questions are logically nonsensical because the querent thinks they know more than they do. A lot of these have the form 'How do I use X to accomplish Y?' There's nothing wrong with this, except that sometimes X is a chocolate-covered banana and Y is the integration of European currency systems."
— Mark-Jason Dominus