The only reason I might ask a trivia question is to observe the person's attitude. If it's an irritated "WTH? Why is she asking me that?" I would not be impressed (even if it's a not unreasonable reaction in most circumstances since the interviewee doesn't know why).
What would impress me would either be an accurate answer or an honest, "I don't know, but I will find out for you."
The latter assumes I'm interviewing someone who will be dealing with customers or clients, and it shows a willingness to put in a bit of effort to answer their questions.
I've had so many instances of BS treatment from clerks and salespeople who don't want to bother answering questions, and either disappear, ignore the question, or tell me "we don't sell that/we've never sold that" and I know they're lying to cover ignorance or apathy. I explained this to the manager at the local Staples one time a few years ago, when I wanted to buy a Sony Discman, to replace one I'd had before. I'd looked it up on the store's website, knew they sold it, and decided to go to the store and buy it in person rather than wait to get it in the mail.
When I got to the store, the person I normally dealt with was busy with another customer so I asked someone else - a young woman: 'I'm here to buy a Discman; which aisle do you keep them in?"
She got a blank look on her face, informed me that "we don't sell those, nobody's sold them in 20 years, you have to go to a pawn shop."
When I told her I'd seen one listed on the store's website the previous night, she just shrugged.
In that case, I think I was justified in being severely annoyed. The right answer from her from the get-go would have been "I don't know, but I'll find out for you/I don't know, but I'll find a manager to help you".
I informed both her and the manager - when I was able to get hold of him 3 days later - that her ignorance and lazy, apathetic attitude had cost them a sale. I'd purchased the Discman from London Drugs and got great customer service from that store.
On the matter of which cat I'd be... DSH (Domestic Short Hair), aka ordinary house cat. Not Persian, because it would be more likely that some people would be allergic to me and I'd end up in a shelter, or possibly at the vet because my humans wouldn't know how to properly groom me so I didn't get too many hairballs from my own grooming. And I wouldn't want to be a blue-eyed, white-haired cat due to the increased possibility of being or becoming deaf. And yes, I would drink milk - Whiskas cat milk (it's slimy, brown, and disgusting to smell and touch, but Maddy loves it).
As for 'why is it called a manhole'? Waaay back when, it used to be referred to as a "sewer hole". 'Manhole' sounds better.