The professor grinned. His complicated arrangement of mirrors worked perfectly, allowing us to observe in secret from the room above. We couldn't hear what was being said, more's the pity, but judging by the reactions to it, it was unforgivable stuff.
As I was rolling on the floor laughing, I noticed an odd thing. "Professor, do you smell oranges?"
"Don't be silly, Moran. There are no oranges in this room. It's the truth serum you smell."
"Is that a fact?" As the possibilities began to dawn on me, I asked, "Tell me, Professor, how much do you weigh? When's the last time you kissed a girl? Where do you keep the money?"