Maybe you missed it the first time around because of a conflict with another show or lack of interest. Or maybe you just forgot what night it aired, because before the advent of DVR it was hard work keeping track of shows that the networks constantly moved around in search of a wider audience and bigger ratings. Whatever the reason, television boxed sets are essential for catching up on classics from before you were born and new favorites you may have missed. Here's a handy guide to some of the most popular comedic and dramatic television shows available on DVD. Now, you really have no excuse.