Lately, there has been a growing theory that AMC's mega-hit, Breaking Bad, might actually be a prequel to it's equally mammoth hit, The Walking Dead. Apparently, the theory is built upon Merle's pre-walker occupation as a drug dealer with possible ties to Jessee Pinkman. While I'm not necessarily sold on the theory, I do think it would be a genius move on the part of AMC, and keeping with the popular trend of merging popular franchises ala Marvel's The Avengers.
For more details on the theory, click here.