A Grave Gravelly Voice
(My religious studies professor looks like James Earl Jones, wears sunglasses to every class, never changes expression and is extremely strict.)
Professor: “[Student], why would a sick man hide out in the tombs?”
Student: “Um, because he was isolated due to the health care standards in Leviticus?”
Professor: “Maybe… or maybe he was gravely ill.”
(Beat, then half the class starts giggling. The professor never once changed expression.)