MacGyver: I'm going to need a nail.
Lisa: What for?
MacGyver: Well, if I can weld a good spark plug it'll replace the electrode.
Lisa: How are you going to weld it?
MacGyver: With wire, a battery, and jumper cables.
Lisa: How do you come up with this stuff?
MacGyver: Well, the stuff's already here, I just find a different way to use it.