I keep running around in circles. 'Till I stop:

The definition of "borrow"

On Monday, on a day I suspect was fraught with nervous first-time mid-term writings all over the building, a random guy stuck his head in my lab.

Him: "excuse me Miss, may I borrow a pencil?"
Me: "Sorry? A pencil?"
Him: "Yes, a pencil."
Me: hands him my only pencil, kept very sharp and ready-for-use, thinking he was going to write something down, then immediately pass it back.
Him: "Thank you". Proceeds to leave, never to be seen again.

I hope he accidentally skips one question on his bubble sheet answer form, making all answers off.