I've done something like this with my bank, I tell them it's a bunch of nonsense because the security question recovery is just a variation of a weak password so we'll need to validate me some other way. They always can
I was on a first date and forgot my wallet so the first place we went was the bank. I had to repeat all my info 3x. I leveled with them and pointed to my date and said I need $100. They gave me the $100.
I've certainly heard people speculate that would be the case. I always just put together 2-3 words unrelated to the question, e.g. my first grade schoolteacher is "Antique Campfire".
Anecdotally I've heard of this type of social engineering working. It's probably better to use some randomly generated real words. Another poster suggested diceware.
I haven't tried, but I am not on the phone with support much as I go to great lengths to avoid calling haha. The one time I had to verify my security question, I told the representative that its a long, random character string and they waited for me to open up my password manager to read it out to them.
I think the best way to do this is to use a passphrase so that it's clear that it's not just gibberish but you have the benefit that it's random text. Obviously at the end of the day, it all comes down to the person on the other end of the phone but I suspect they'd be more suspicious of someone saying "it's a bunch of gibberish" when they can see "grumpily siberian pampers panorama unroll aloof masculine mandatory" versus "YpZVpyQHsmPATt1P" (also the former is much easier to read over the phone).
I didn't even have to try. I was prepared to read off the random string, and the operator went with some other piece of information from my profile instead.
