This one time, late one night on the evening of day light savings, I put all the clocks forward one hour as instructed by the reminders on TV.
But when I woke up the next day I couldn’t recall if I had done all the clocks, so I went through the house and put the clocks that I didn’t think I had changed yet, forward an hour.
It wasn’t until later that afternoon that I realised my mistake.
Instead of putting the clocks back, I had put them forward. Twice.
So I was out by 3 hours.
But give me a break, I was only 10.
Since then I have learned the expression “Spring forward, fall back”, and I never go wrong.