-Back when the TSR staff was maybe eight or ten people, apparently Gary Gygax would once a day throw a fit in trying to deal with writing the rules. "To hell with this," he'd shout, and walk out of the office. He'd be back an hour later, usually with ice cream.
-One of the earlier modules that ALMOST saw publication featured musical interludes. The module would have been published with a thin plastic record (remember those?) and players woiuld have to improvise lyrics to defeat a part of the adventure. Reportedly, dancing was also involved. In-game.
-The very first D&D-induced wedgie was given in 1975, when Patrick Grumboldt from Erie PA told a TSR member at a convention about a bizarre and hostile reaction to the game from a football player he'd tried to introduce the game to.
-For roughly three months, Dave Arneson would only respond to his character's name. This stopped when people started avoiding him in the TSR halls.
-The story about Gary Gygax accidentally "creating" the green slime after coughing up phlegm on the game mat is not only false, but rather disgusting.
-Rob Kuntz's first reaction to the eagerly anticipated Return to the Temple of Elemental Evil was to put it down, sigh, and shout "What the hell?"
-The above is all made up, but was fun to write.