Change Your Mind in Mid-Zoom

If you start to click-and-drag with the Zoom tool (Z) to zoom in on a specific area and then realize you've positioned your mouse in the wrong place, don't let go of the mouse button. Press-and-hold the Spacebar, reposition your cursor, then let go of the Spacebar to continue selecting the zoom area. Once you try this one, you'll find yourself using it more often than you think.