The good folks at io9 offer a dozen tips to help you make your run as an evil wizard a much more successful one than we usually see depicted onscreen. The twelve blunders listed are usually fatal to your plans for worldwide domination and very often fatal to you yourself, should you be the aforementioned evil wizard. The list might help you to avoid the unpleasant aftereffects of said blunders, such as the aforementioned death.
Of course, you might also avoid death by not being an evil wizard but instead use your powers for good. That one didn't make the list, though.