I'm not the brightest student at my University, by any stretch of the imagination, but I often find myself being asked for advice. Maybe it's the 'mature' student status.
Yesterday I was asked (dead seriously) the following, as we waited for a lecture to begin:
Student: "Is Bolivia in Brazil?"
Me: "No, but they're both in South America"
Student: "But I don't understand!"
Me: "Sorry, What don't you understand?"
Student "How come these nuts are produce of Bolivia if they're supposed to be Brazil Nuts?"
Me: (When I'd recovered myself)
"Well, it's just about the type of nut they are, like Cheddar cheese, or Eccles Cakes."
Student: "Those are places?!"
How on earth the poor lecturer was supposed to explain eschatology after that, I have no idea!