Do you guys remember Monsters of the Gridiron?
I was never a kid that was into sports, but I remember thinking these were super cool. I lost these somewhere, alongside my Goosebumps collection, but a good friend of mine had Ronnie "The Rattler" Lott's card and generously gave it to me!
They never really scared me, but I did get weirdly creeped out by some of the make up. Apparently there was some sort of contest, but I don't remember that in the slightest.
There's even a BEHIND THE SCENES video over on the NFL site. This is the most enthusastic I've ever been about pro sports.