Professor: "Can anyone hear me in the back row?"
Us: Blank looks all around
Prof: "Are you all *garbled something or other* or are you naughty?"
Me: "Did he just ask if we were naughty?"
Guy sitting next to me: "He asked if we were 'nodding.'"
Me: "Oh wow, thank god, I didn't want to have to answer that!"
Guy sitting next to me: "Heh heh"