Friends
How I Married Your Mother
I haven't watched basically any sitcom since Seinfeld, other than Scrubs, which is hilarious.
Deadwood is one of the best shows ever produced for television. Watch it, with closed captioning, as soon as possible. Without the CC, you will miss much dialogue due to the way the characters speak - iambic pentameter laced with cursing - a LOT of cursing. Record-breaking cursing. It's jarring at first, and you initially believe that it's excessive and unnecessary. But as you watch the series, it kind of fades to the back, as you are mesmerized by these characters.