It’s obviously not what I replied with but it’s been bugging me ever since as I can’t think of anything even vaguely acceptable.
Trying to get back into work as youngest will be starting school soon. I had an interview today for a job I didn’t particularly want but thought interview practice would be good. All going along fairly well, I thought until I’m asked ‘what would you say the worst thing you’d ever done is?’ I ask if they mean in a work capacity and interviewer 1 says ‘no, just in an overall capacity’ while interviewer 2 gives an expectant head tilt. For reasons I don’t fully understand I said ‘I’m a compulsive liar, everything on my CV and that I’ve just told you is a lie’ and then giggle. They both look at each other raise eyebrows and continue with the interview. I did try and tell them at the end that I was just joking but I think they’d written me off by then 
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I’ve spent the afternoon cringing and trying not to think about it. But what is the correct answer? I can’t think of anything you could say that wouldn’t make you look like a liar or a terrible person. Is that a normal interview question now? I was all practised for the ‘what are your strengths and weaknesses’ type questions but not ready to tell them the worst thing I’d ever done!
Also, if by any ridiculous miracle my interviewers are reading this thread - I was really nervous and I thought it was vaguely funny and infinitely better than actually telling you the worst thing I’d done.