I did a search before I started this thread, and found a similar one in the archives that was about 5 years old, but this one is about your favorite quotes from characters other than the Doctor. We all know he has a million of them so lets give the others a chance to shine. They don't have to monumental quotes, just anything that stuck with you or made you giggle.
I'll start with a couple I can think of right off hand.
From School Reunion:
The Headmaster: "Ignore the shooty dog thing."
From New Earth:
Cassandra: "Goodbye trampoline hello blondie."
"Oh I hate telepathy, just what I need, a head full of big face."
"Oh chavtastic again."
I could go on, I just love Cassandra in this episode. I thought it was funny how at the end she died in her own arms. How appropriate.