[Jan communicates with the monster in the closet.]
Jan: Do you understand me? Knock once if you can understand me.
Servo: Knock three times on the ceiling if you want me!
Jan: Do you understand me? Knock once if you can understand me.
Servo: Knock three times on the ceiling if you want me!
[Jan communicates with the monster in the closet.]
Jan : Do you understand me? Knock once if you can understand me.
Servo : Knock three times on the ceiling if you want me!
http://www.tv-quotes.com/shows/mystery-science-theater-3000/quote_30121.html
