I’ve seen so many good ones lately and I want to devote an entire thread to it.
Here’s Pryor and Reeve in Superman 3 rehearsals. Also, Superman holding up a cab with one finger. Can there be a more Superman pic than Superman holding up a yellow cab with a single digit? I suspect from Reeve’s slightly thinner build (he didn’t bother bulking up) this is from Superman 4, his hairline being a little different from the other movies here too.