My better half and I quote Star Wars (and other favorite movies) so much it's difficult to think of one specific instance.
But I have a good one, I think. One time I was giving some flight instruction to a friend in a small twin engine plane. On takeoff, as he added power, he said "Punch it, Chewie!" To which I immediately (almost robotically) responded with an imitation wookiee growl. I have to confess that I've since "borrowed" it from him and use it periodically myself now.