I think Empire Records is my fall-back quotable movie.
I find myself constantly saying things like "What's with today, today?" and "In the immortal words of The Doors, the time to hesitate is through." or "I wonder if I'll be held responsible for this?"
And, in a dream come true, I had an actual boss named Joe. Not kidding. I told him all the time, "You're a superb manager, Joe." just because I could.