Captain Kirk: Everything Harry tells you is a lie. Remember that. Everything Harry tells you is a lie.
Harcourt Fenton Mudd: Now listen to this carefully, Norman. I am… lying.
Norman: You say you are lying, but if everything you say is a lie, then you are telling the truth, but you cannot tell the truth because everything you say is a lie, but you lie… You tell the truth but you cannot for you lie… illogical! Illogical! Please explain! You are human. Only humans can explain their behavior! Please explain!
Captain Kirk: [giving him the same statement the androids have repeatedly given him several times before] I am not programmed to respond in that area.
Captain Kirk: Everything Harry tells you is a lie. Remember that. Everything Harry tells you is a lie.
Harcourt Fenton Mudd: Now listen to this carefully, Norman. I am… lying.
Norman: You say you are lying, but if everything you say is a lie, then you are telling the truth, but you cannot tell the truth because everything you say is a lie, but you lie… You tell the truth but you cannot for you lie… illogical! Illogical! Please explain! You are human. Only humans can explain their behavior! Please explain!
Captain Kirk: [giving him the same statement the androids have repeatedly given him several times before] I am not programmed to respond in that area.
Star Trek (TOC) “I, Mudd”