Promotional fake United States currency

It is legal to print so long as it makes no assertion, whether by appearance or statement, of authenticity.

They were issued as novelty items and as political commentary on inflation that occurred under President Nixon.

In the 1960s, Mad printed a $3 bill that featured a portrait of Alfred E. Neuman and read: "This is not legal tender—nor will a tenderizer help it."

Mad writer Frank Jacobs said that the magazine ran afoul of the US Secret Service because the $3 bill was accepted by change machines at casinos.

[1] The Libertarian Party makes an annual tradition of handing out informational fliers made to look like $1,000,000 bills on April 15 to draw attention to its anti-income tax platform.