Here's a 1956 Kellogg's Corn Flakes tie-in ad from DC. Show everyone you're a SUPERMAN fan, it says. I don't know...why do I think the more likely scenario would be that some bully sees your belt buckle and says, "So you think you're as tough as Superman, huh?" and it all goes to hell from there? Oh and did no one notice that Superman's belt is actually yellow...not red? Or would a yellow belt have looked even wimpier?