I'm looking for a Superman comic that I saw years ago. I'm guessing it was first published in the 70s or early 80s.
The premise was that in order to prove to others that Superman and Clark Kent could be seen in the same room together (to protect his secret identity), Superman created a cardboard cut-out of the Clark Kent identity placed in front of a news camera, while Superman zoomed around in the background.
Does anyone recall which comic this was?