Probably the time I used a cash machine in a weird place in my home town to draw out the maximum I could for Christmas spending and all I got from it was the receipt saying the money had gone from my account.

The place was weird because, although it was in a very public square, it was kind of high off the ground, like it had been installed for people over 6ft tall. I am not that tall. The novelty appealed to me anyway. Mistake.

I was so ashamed, I never reported it. I didn’t think I’d be believed.

If you want actual things, I own a pre-smartphone electronic personal organiser that I used about five times and about a dozen calculators from when I got really into them for some reason. And at least one of those was “parts only” that I completely missed in the description.

But if I could undo anything, I’d rather have that cash machine money back.