A word, when called, nullifies a previous shotgun call, and immediately enters the "shotgun"-caller and the "shambles"-caller into a best-two-out-of-three paper-rock-scissors match, winner receiving the shotgun seat.
NOTE: "Shambles" may be avoided by modifying the "shotgun" call to "shotgun-no-shambles".
"Shotgun!"
"Shambles."
(paper-rock-scissors match ensues)
(or)
"Shotgun, No Shambles."
"You win."
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