Simmerron
Da infamous "Cadillac dat wasn't", with a hideous body-design and a lackluster engine dat always ran a bit hot, matching da tempers of any folks unfortunate enough to drive them.
Da Cadillac Simmerron has a bit of a cult following nowadays, just as with other classic "cars we loved to hate" like AMC's Pacer and Gremlin. But most folks --- and even GM itself --- would prefer to just forget about them!