My first car was an ancient Renault that was plagued with electrical issues, to the point that it was actually pretty funny. I was also a penniless student at the time and I don't know how to fix cars, so I just sort of put up with it.
It used to drain the battery when it was parked, so I kept a spare battery in the boot and some jumper cables and used to have to jump-start it every time I switched the engine off.
One time I was driving at night and the headlights started dimming until they were nearly off, I turned the radio off and they came back on again.
Eventually I finally took it to the scrap yard, they said it was worthless but they gave me £10 for the tape deck lol.
Technically the worst car I ever had, but also one of my favourites.