Fact and Fiction

My students are delivering narrative oral presentations, but I start to suspect a student is fabricating eir account.

Me: Can I interrupt you for a second? Is this real?
Student: Huh?
Me: Did your story really happen?
Student: Uh, no, I made it up.
Me: You know it's supposed to be true, right?
Student: Well, yeah, it is.
Me: How's that?
Student: I made up a true story.

That's a new one.