Atlas (Marvel) comics “flatters” EC’s Mad comic book by introducing their own satire comedy comic, Crazy #1 (September 1953). Most of the same shtick that’s in Mad is here: crazy antics and pop culture references (Dragnet-inspired narration of Frankenstein).
The Crazy comic didn’t last long, it was later revived as a magazine, once again copying Mad and adding fake ads, mascots, etc. Crazy was basically a footnote on the page of Mad Magazine.