When you take a philosophy class, be prepared to explain how any object exists. In 1990, I remember my philosophy teacher asking the class, "How do you know that anything exists--this desk, that pencil, this (upon spotting a student's Walkman) Screaming Trees tape?"
The teacher made several more references to the Screaming Trees tape. I don't recall how we proved that it existed. I know the band must have been real, however, because I played their music the following year on KCOU. (In fact, I just listened to "Bed Of Roses." I'd forgotten how it was one of the better indie rock songs of its time.)
I wonder what the equivalent of a Screaming Trees tape is for today's philosophy instructors--and how students prove that it exists.