Bought a train ticket today and handed over the plastic.
Metro train person: “PIN or sign?”
Me: “PIN thanks.”
Metro train person: “You need to sign it anyway.”
Me: “That doesn’t make sense.”
Metro train person: “I guess it’s just a double check.”
Me: (rolled eyes)
Metro train person: “I guess it’s just a double check for your benefit.”
WELL IT FREAKING WOULD BE, METRO TRAIN PERSON, IF YOU ACTUALLY COMPARED THE SIGNATURE ON THE CARD TO THE PIECE OF PAPER I SIGNED! IDIOT!
Oh, and have a Merry Christmas, Metro train person.
Paul Daniel's Views On The World, For What They're Worth 
Same thing happened to me in Coles a few weeks ago. In that case it was a glitch with the machine; it had the PIN but said it wanted a sig as well.