Spin two nuts onto the bolt, tightening them against each other. Then chuck the bolt into the drill and hold a hacksaw blade against the spinning bolt. The nuts help to steady the blade and clean off burrs when you unscrew them.
Clothespin as Nail Holder: Avoid hammer accidents (and protect your thumb!) when hanging a picture by using a clothespin to securely hold the nail instead of your two fingers. Not to say the other million things we did with them.