I had a 96 Ford Aspire that had some interesting electric gremlins.

At random point the headlights would start flashing on and off like strobe light. The only way to make them stop and act normally was for me to pull the handbrake for just 1 click. Everything would then return to normal.

I asked my mechanic to look at it multiple time but we never figured out what was going on.

When I traded the car in, I made sure the handbrake was clicked once before the guy went out for a test drive....