The key thing is to be honest, and it will show through in your answer.
I had something like "what was your worst experience while flying" or "give an example of when things went wrong while flying"
I had an example where I pushed on into bad weather, explained that I was typically low hours PPL, and that my training kicked in, and although I'd given myself a fright, I learnt a lot from it and from then on had a lot more trust in what I'd been taught.
You can then apply this to "If I'd followed the SOP this wouldn't of happened" and the fact you have first hand experience to back up the importance of SOPs or training then that goes in your favour.