[Dick is fantasizing about Nina during his class's exam]
Leon: [sees Dick kissing an imaginary person] Dr. Solomon, what are you doing?
Dick: ...I said no talking, Leon. You fail!
Leon: [sees Dick kissing an imaginary person] Dr. Solomon, what are you doing?
Dick: ...I said no talking, Leon. You fail!
[Dick is fantasizing about Nina during his class's exam]
Leon : [sees Dick kissing an imaginary person] Dr. Solomon, what are you doing?
Dick : ...I said no talking, Leon. You fail!
http://www.tv-quotes.com/shows/3rd-rock-from-the-sun/quote_19363.html