I don't know what kind of junk email this qualifies me for, but I'm willing to bite. I love Popular Mechanics!
They had this:
O Please use e-mail to send me information about other offerings.
O Please do not use this data to send me information about other offerings.
which seems... mutually exclusive. I have no idea what checking both (or neither) would invoke, but rather than risk the wrath of the spam gods, I checked the "do not use..." box.