Mines is quite simple.
I bought a new MG ZR a few months before MG went down the tubes.
It really was junk and I had to sell it at 18 months old. It was a 2nd car and was supposed to be kept for 5 years to justify the cost.
After it was flogged I never had an MG so I was MG free. I shortened it to MG3.
Then SAIC MG come along a few years later and steal my username to stick on the back of a poor looking copy of a Fiat Punto.
I'm sure that was one of the reasons why I was banned from .CULT