<font face="Verdana, Arial, Helvetica, sans-serif" size="2">We have had to refuse cards where the signature strip had worn off of CC. (the word void will magically appear)</font>
Yes, I can currently see "void" three times. So far, no one's refused it (and so many places have those swiping machines they never even see the card), but I do need to call for a new one.