'Some TV shows plant themselves so deeply in your brain, you can't help but rewatch them over and over, and often, it's the rewatches where you really begin to understand what makes these shows so special. Some TV shows are too heavy or difficult to watch more than once, but for others, you can't help but watch them again. Some of the shows on this list are worth watching again because they have such thematic depth and large character ensembles; you learn something new each time. Some shows are packed to the brim with jokes, and you have to watch...