Breaking Bad is the one I've got into most recently, after being told about it by someone at work.
So they reckon, it's critically acclaimed as the best thing of it's kind not to be screened on UK TV, and it's on Season 5 in the States.
Basically it's about a high school chemistry teacher who finds out he has a terminal illness, and America being America, there is no way he has the resources to either fund his treatment, or fund his family if and when the illness stops him working. So out of desperation, he turns to making the purest crystal meth the Southern United States has ever seen, and that's when the fun starts!
If you haven't seen it, try the first series, it'll either grab you, or it won't.
What is left of your dream?
Just the words on your stone.
A man who learnt how to teach,
But forgot how to learn.