“I don’t know why patients try to lie. It’s not like it’s a big deal”
[patient walks in with a butt object]
“Oh gee, how’d it happen?”
All they gotta do is not ask. I assume it’s not medically relevant. Dude’s got a cucumber in his butt, everybody knows how it happened. What’s the point in asking?
Probably to make the patient squirm and see what excuse they come up with so the job isn't as drab?
More seriously, they need to know the circumstances of any accident to be aware of potential other complications or risk factors. That's just a standard question they have to ask.