A sign behind the counter listed items like "Dumb Caramel Frappucino," "Dumb Cafe Mocha" and "Dumb Ice Coffee," available in "Dumb Tall," "Dumb Grande," and "Dumb Venti." The coffee as well as pastries were given away for free, and the cash registers were dark, according to reports.
News of the prank quickly went viral and lines for the fake coffee shop ran down the sidewalk.
Starbucks denied having any affiliation with the store.
(Read more: Starbucks' Schultz:There's a 'sea change' happening)
"While we appreciate the humor, they cannot use our name, which is a protected trademark," a company spokesman told NBC News.
A "frequently asked questions" form posted at the site purported that its creators considered it a parody and therefore immune from lawsuit.
"For legal reasons Dumb Starbucks needs to be categorized as a work of parody art," read the document. "So, in the eyes of the law, our "coffee shop" is actually an art gallery and the "coffee" you're buying is considered the art."
Fielder continued this line of reasoning in a video released on YouTube shortly after the media event where he portrayed himself as a new small business owner, serious about getting rich.
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"By adding the word "dumb" we are legally allowed the coveted Starbucks name and logo because we've fulfilled the minimum requirements to be considered a parody under U.S. law," said Fielder in the video.
Legal experts questioned the soundness of this argument.
"Trademark law does not, contrary to the suggestion by Dumb Starbucks, have a definitive parody defense," said University of Notre Dame Law Professor Mark P. McKenna.
During the press conference, before the Health Department arrived, the comedian said he planned to keep the store open "forever," and that he would be opening another one in Brooklyn next week, USA Today reported.
—By Ben Popken of NBC News