I don't watch a lot of television, but I've certainly got hooked on Ghost Hunters on the Sci-Fi network. TAPS (The Atlantic Paranormal Society) investigates claims of paranormal activity in private homes and public buildings. Roto-Rooter plumbers by day, ghosthunters by night, Jason Hawes and Grant Wilson are two of the best personalities on TV.
By the way, this is a reality show, not a sitcom. TAPS actually exists, and Jason and Grant are real guys. And they come across as two of the nicest guys you'd ever hope to meet. Have you ever had to comfort someone when they found out that their house wasn't haunted?
While not a big believer in the paranormal, I still find it fascinating to see some of the things these guys capture on video. Watch their show or visit the TAPS website.