I remember when I had it, I was trying to get an old car running to bring it to a workshop. I was sitting in it, trying to disable the immobiliser as I’ve done

I remember when I had it, I was trying to get an old car running to bring it to a workshop. I was sitting in it, trying to disable the immobiliser as I’ve done about 100 times before, and just could not do it for the life of me. My troubleshooting skills were gone. All I could do was repeat the same actions and get more frustrated as I couldn’t start the engine.