They don't really care what the most interesting bug is anyway, they just want to have a conversation surrounding bugs. You can also turn it to "well, in general [..]".
Also don't be afraid to say "ehm, let me think for a second", instead of feeling obliged to answer right away.
Edit: I say something along the lines of "Oof you put me on the spot now haha. What was one of yours? Maybe something comes back to me when I hear you"
I think people generally ask that in hopes to break the ice or to connect with the other person. So, either they will answer and it might nudge a memory (if they prepared/remember) or they'll blank as well and you'll have a laugh over the question and move on.
It's an interview, not an interogation! I know your livelihood depends on it, but being natural/relaxed helps your odds IMO; as it's less likely you'll get flustered or tilted. I realise this is easier said than done as I'm also plagued with anxieties and phobias, but I never saw interviewing as a stressful situation. At best, you get a job, at worst you forget about eachother in a few days lol.
Surprise, your boss' boss just decided to drop in and is asking your new guy some pointed questions about the deadline. ~Tada~, the IRS is sending someone over who wants to interview a few people. Oops, that lawyer that your clients hired are going around and subpoenaing previous employees.
"So, uh, we need you to tell us your biggest weakness. And bonus points if by the end of your story the entire interview team is crying from laughing so hard."
So ideally, the most interesting bug story response would be a story about how awesome you are at finding bugs that are introduced by other organizations than the one you were working in AND make the listener like you.
* Look this candidate can fix bugs. * Look this candidate knows not to talk about the dirty secrets of the org they are (were) a part of. And is able to defect blame to another entity. * Look this candidate makes questioners like them which will hopefully keep too much scrutiny from being applied to them.
Like write down 5-10 of these questions and answers that are somewhat common.
Write down some anecdote and more or less use the same all the time.
The same with telling about yourself write down 5-10 sentences and use that every time. Of course you probably have to update it from time to time but remember that you don't have to come up with everything on the spot.
You might not get exact same questions but if you have some things written down you can still start by rehearsed anecdote to get yourself going. Because if it is open ended question it might be more important to keep conversation going than "being correct" on your answer.
Was a shame. But I guess I should really rehearse my "STAR" stories :-|
I ended up just making up a fake story on the spot that was uninteresting and barely coherent. That was the first question I was asked in the interview, and made me nervous for the rest of it. Didn’t get the job.
Clearly I should have taken an improv class in preparation.
But yeah, I learned the same lesson as you: prepare and rehearse a bunch of fake stories in advance. Completely stupid waste of time, but necessary.
It could be an interesting part of the interview that reveals a lot about the candidate, but realistically it’s going to favor the people with rehearsed fake stories. What are the chances that your genuine real-life experience is more interesting than someone else’s fake one specifically crafted to be as interesting as possible?