Moore's paradox (or something like it) in the mail
A few days ago, I received a postcard. On one side is a picture of Barack Obama, with the caption "I value your ongoing support," and a facsimile of his autograph. On the other side, it says "This communication is not authorized by any candidate or candidate's committee."
Granted, this is not precisely Moore's paradox, but it seems close. (Hmm... what's the relationship between uttering P and uttering 'I authorize the communication of P'?)