Just joking, but me it was the 2002 Ford Explorer and its endless problems with the transmission, the wheels, the windows and everything else that could go wrong.
Just looking at carcomplaints can show you the size of the problem, with 1,500 reports of transmission problems alone.
I was still amazed at the stupidity of them bringing back the Taurus name after it’s hiatus. Should have just kept the 500 name.