Shanghainese is becoming a lost language. No one speaks it anymore, so it's very satisfying to find a comedian that not only understands what it means to be a true Shanghainese, but also one who's comedy is witty, subtle, and extremely relevant. 周立波 is absolutely hilarious. The jokes are mostly regional - it's difficult for someone not from Shanghai to relate. Having said that, I'm tired of the current crop of Chinese comedians, 98% of which are from the North, and whose jokes reflect that heritage. I'm a good old Shanghai boy, I need good old Shanghai comedy.
Watch the first video. The last 3 minutes had me screaming with laughter. If it helps, he is impersonating a 1980's Shanghai cigarette hawker.