soap game
n.— «The “soap game” which was started last year drew more than 200 fans and attendance tomorrow night should be even better. Admission to the contest is one average size bar of soap.» —“Announce Lineups For Soap Game” Constitution-Tribune (Chillicothe, Mo.) Sept. 2, 1964. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...