Hammer - In ancient times a hammer was used to inflict pain on one's enemies. Modern hammers are used to inflict pain on oneself.
Pliers - A device used to extend your reach the necessary few inches when you drop a one-of-a-kind screw down behind the new wall it took you two weeks to install.
Multi-Pliers - Contain a handy assortment of sharp and dangerous tools. Best left in its leather sheath and worn on a homeowners belt to increase testosterone levels.
Electronic Stud Finder - An annoying device that never goes off when you point it at yourself.
Cordless Drill - A device that lessens your chance of electrocution 90% over a standard plug-in tool.
Cell Phone - The handyman's 911.
Chain Saw - Allows you to cut your way out of the shed that you accidentally built completely around yourself.
Vise Grips - A pair of helping hands that doesn't critique the job you're doing or offer advice.