The -Minus World hallucinated a ransom demand from Bowser to Mario Re: Princess Peach (aka "ho" according to this) - but look closely. All the letters were cut from game-related logos.

Can you guess from which source all 39 letters came? Skimming over it I can recognize a dozen, easily. Spoilers are in the comments at the link.

Mario Receives Ransom Letter [The -Minus World]