Mine are all car related, lol.
I once drove around for 6 months without insurance and forgot to renew my tax, because it's free on my car. I only found out because I got a flat tyre and tried to call my insurers roadside assistance. It turned out they had erroneously cancelled my insurance and sent the letter when I was in between moving house. The letter arrived only hours before the post office put my mail redirect into action (they had dragged their feet on that). Needless to say, I quickly reinsured and taxed my car!
I once fell asleep at the wheel. Thankfully it was an empty road, late at night and I woke up when I drifted into the kerb. No one was hurt, apart from one scraped alloy.
I was unknowingly complicit in my XDP stealing a car. We drove across a foreign country and left it at an airport. He put the keys under the wheel arch and tried to tell me that's what you did with hire cars, which was when I got suspicious. He came clean when we were back in the UK.
A friend and I got off our faces and decided to go for a drive (they drove, I didn't back then). We put on 80s wigs and were wearing pyjamas. We stopped at an off licence, parked right outside, went in and bought more booze and then drove off. How we didn't get reported by the shop clerk or pulled over by the police I don't know. And how we didn't kill or injure ourselves or anyone else is a miracle. Friend was in a job where any kind of criminal record would have lost them their career completely and they begged me never to tell. They don't do that job any more, nor anything remotely related, so I feel safe to tell now.
Oh, one not car themed!
Homebase delivered two freestanding lamps to DSis when she only ordered one. DM accepted the second one not realising the first had arrived. She called and they said to keep it, so they gave it to me.