I think I have some different ones. Whenever my wife asks me to kill a spider and I'm to lazy to get up from whatever seat I'm sitting in I go with "The spiders is good. They eat the cockroaches." That's from Fletch Lives.

I also consistently do the classic "Is it!?" line from Braveheart when I get told one of my comments is funny or other wise worthwhile.

Sometimes when my face gets scruffy and my wife asks about it, I do the "Perhaps I should grow a beard?" That's from Bram Stoker's Dracula, but changed a bit to fit the perspective.