18: BMW X Coupe
The BMW X Coupe was a concept car released in the early 2000s and it didn’t look horrible. The problem was that the X Coupe was a tiny cruiser at a time when cars were getting larger. We can assume that the X Coupe was the precursor to the production model 1-Series which came later in the decade.
Consumers have been hungry for a bite-sized BMW for decades, but the X Coupe was far too boisterous. The dimensions of the car just didn’t look like something consumers would gravitate to. When the 1-Series hit the market it was not the best seller BMW had hoped for and so the X Coupe was canceled.