The quote "I reject your reality and substitute my own!" is from a 1974 episode of Doctor Who entitled The Deadly Assassin.
It was also used in the 1984 low-budget Science Fiction/Fantasy film entitled "The Dungeonmaster" (aka Ragewar).
The quotation was then made popular by Adam Savage on Mythbusters.
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The phrase "I reject your reality and substitute my own" was popularized by Adam Savage on the TV show "MythBusters." He used it as a catchphrase to humorously challenge established beliefs or viewpoints.