K-9 Doesn't Fetch

Rex: Here's an idea.  You go over there, and I'll throw this stick to you. Then--
K-9: This unit does not play fetch.
Rex: But--
K-9: This unit does not play fetch!
Rex: You're a dog. You're supposed to sample any food in front of you when Master & Mistress aren't looking. You're supposed to gnaw. Face it: you have to play fetch. It's part of your programming.
K-9: You keep telling me Daleks aren't evil, and then you say something like that?

K-9 & Rex Dalek