Leonard bids on a movie prop and ends up winning. He pays the amount he bid so this is a first-price auction.

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Raj and Sheldon partake in a series of juvenile tit-for-tat exchanges.

Sheldon explains a new versions of Rock, Paper, Scissors to Raj: Rock, Paper, Scissors, Lizard, Spock.

Leonard bids on a movie prop and ends up winning. He pays the amount he bid so this is a first-price auction.

Sheldon and Leonard are playing 3D chess which is a sequential game.

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