Is that really the earliest time we hear Clark's middle name? I know that Martha called him by his full name at least once when she was scolding him. I think she did it when she grabbed his ear and pulled him into a conference room in the Space Rats one.

I actually prefer Joseph as Clark's middle name, which has been used in the comics. I guess I just prefer the name, but both of them refer to Superman's creators.

"It is a remarkable dichotomy. In many ways, Clark is the most human of us all. Then...he shoots fire from the skies, and it is difficult not to think of him as a god. And how fortunate we all are that it does not occur to him." -Batman (in Superman/Batman #3 by Jeph Loeb)