[Yosemitest]

Remember this flop, that left a bunch of worthless "money" in the vaults:

Sacagawea dollar



Reverse

It was almost as bad as their earlier flop;

Susan B. Anthony dollar


Despite the marketing attempts, the coin received an overwhelmingly negative reception from the public.
... many establishments throughout the country began refusing to accept them in payment.
... At the close of production, the Treasury encountered a dilemma:
the Mint struck a large amount of dollars in anticipation of great public demand, resulting in a surplus of 520,000,000 coins in 1981.
Melting the coins was impractical; the cost of manufacture was approximately 2 cents, and the 98 cents earned from seignorage was applied to the national debt.
Had the coins been melted, their seignorage would have been added to the debt.
Accordingly, the coins were placed in government storage, to be dispensed as needed.

So there is MORE WORTHLESS MONEY that is in reality ... MORE DEBT !

[Fresh Wind]

Despite the marketing attempts, the coin received an overwhelmingly negative reception from the public.

Ah, yes, the infamous "Carter Quarter".

[Smokin' Joe]

Don't leave out the Presidential Dollar series, seldom seen outside proof sets, uncirculated sets, and collectors bags/rolls.

Funny, the presidents were on coins of similar material to the Sacagawea Dollars, but their spouses were (and continue to be) commemorated as the series progresses with 1/2 ounce gold coins.