Great topic! Love all the picks so far!
I work several different quotes into my daily repertoire.
1) My reply after I've asked my kids if they've done their chores...
"The look on your face is even more vacuous than usual. You've failed havn't you?" (Higgins, "Ki'i's Don't Lie")
2) I know I've uttered this many times over the years,
"I know what you're thinking... and you're wrong."
3) Conversation to myself every morning when in look into the bathroom mirror...
"It matters. It matters, because sometimes you get to a point where easy rationalizations don't cut it anymore. There's gotta be a place where you stop and examine your life, and if it isn't right then maybe you just gotta say no, and no more, ... or stop looking in the mirror." (Magnum, "The Hotel Dick")
4) When I'm fuming mad!
"This is outrageous! OUT-RAG-EOUS!!" (Higgins, "Thank Heaven for Little Girls...")
http://magnum-mania.com/Audio/outrageous.wav