Ahhhh class.

Prof: "As we can see here in the Capital Asset Pricing Model..."

*cell phone rings*

Prof: "Turn it off."

*errant cell phone rings again*

Prof: *irritable* "I said, TURN IT OFF!"

*classmates stare wildly around the room to find errant cell phone*

*classmates stare at Professor's pocket*

Prof: "Oh, it's mine."