Ctrl+Shift+T - The keyboard shortcut that changed my life!

I frequently work with way too many browser windows open at home, and even more at work.  I had a computer programming teacher that made us program without using a mouse for a few weeks, so I kinda had shortcuts beat into my head.  I thought I knew every keyboard shortcut around, and have always prided myself on being "The Shortcut King".  Lo and behold, I've been missing one all this time!  Ctrl+Shift+T will reopen any recently closed tabs in your browser.  Accidentally closing tabs is a thing of the past!