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The Nukem rule states that is is a bad idea to pre-order a game before its release date has been confirmed. The game could be delayed, or outright cancelled, making any deposit worthless.

This was brought on by the game Duke Nukem Forever, witch was delayed for over a decade.
"Hey man, have you pre-ordered Prey 2 yet?"

"Not going to bother, I follow the Nukem rule."
by Squarks February 18, 2013