It seemed like every humor magazine had to have a parody of RIPLEY'S BELIEVE IT OR NOT, usually with some incredulous fact, followed by a plausible explanation of it.
MAD did an article about how to put out an imitation of them in their September 1958 issue (#41), reprinted herewith. It's funny how they considered TRUMP and HUMBUG to be imitations of them when they are what MAD would have been had there not been a falling out with Kurtzman.
NOTE: THIS PAGE IS FROM MAD. All the others are from THIMK...
THIMK was one of the magazines that did an “answer” to this article. (the other one in FRANTIC, which I'll print later on). Many of these magazines called MAD on their claims of originality, their business practices, and bitterness about anyone using their formula.