This one's something of both a classic and an unsolved Marvel Bullpen mystery.
During my first year as a bright-eyed and bushy-tailed Bullpenner — not long before my daily existence was defined by shitloads of booze and weed — what follows was among the first examples of bizarre letters to cross my path. Editorial received the letter seen below after, well, it speaks for itself:
And what, you may ask, set off this offended reader? Here's the letter in question:
That letter obviously would never have been sent by anyone on the Marvel staff and no one by the nae of "J.P. Cardo" ever worked there, so I'm guessing it fell into the hands of a certain intern whose time at Marvel ended fairly swiftly due to his Bronx-bred general assholism. I have no proof of that, just supposition. But whatever the case, whoever wrote it gains points for rendering an otherwise sophomoric prank letter into a work of genius by making the "O" in "FUCK YOU!!" a Spider-Man head. Well played, sir!