Running Gag/Tabletop Games

Board Games

 * Warhammer 40,000 has a few created by fans. Especially the Imperial Guardsman's standard issue flashlight. I mean lasgun.
 * Bjorn the Fell-Handed is the oldest Space Marine in existence, and remembers walking beside the Emperor and his Primarch ten thousand years ago. Fans like to joke that his chapter only wakes him up when they want to hear stories.
 * Due to having a habit of "finding" relics from other chapters, the Blood Ravens have been called the Blood Magpies.
 * One 1d4Chan story includes the Blood Ravens "finding" Bjorn the Fell-Handed.
 * PAULDRONS

Tabletop RPG

 * Many editions and supplements of Mekton have featured mecha pilots with similar names asking their (also similarly named) techs to build them either six-armed Humongous Mecha (because they "got a very good deal in a half dozen beam swords") and/or smaller infiltration units designed to look like a Coke vending machine ("It even gives change!"). They are also invariably hit on the head with a large wrench for their efforts.
 * Everything is treason in Paranoia. Everything.
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 * The computer is your friend. Have a nice Daycycle!