The line comes from the pilot episode of Twin Peaks, the 1990 mystery series created by David Lynch and Mark Frost. Pete Martell discovers a fish inside a coffee percolator and reports it with total seriousness, a perfect example of the show's mix of small town normality and surreal detail. The quote was repeated by fans for decades, quoted in articles and fan communities, and later clipped as a short reaction sound online because it sums up something inexplicably wrong in one memorable sentence.