I've been doing this for 2 decades. I once had a surreal experience when one store clerk in the US complained that my signature did not match the one in the bac

I've been doing this for 2 decades. I once had a surreal experience when one store clerk in the US complained that my signature did not match the one in the back of the card. My pleas of "that's not a signature, it's a request to check my ID, which you haven't done" did not move him so I had to request his manager's presence. It only happened once and that was many (15+) years ago, but if you ever wondered if it could happen, yeah it could. :)