doggerels are very popular in beijing, they are just powerful and show us how witted common chinese are. but it's rare in shanghai, here are two i just learned from friends:
wo men de cheng shi xiang ou zhou, wo men de nong cun xiang fei zhou
(our cities are like europe, our rural districts are like africa)
lao a xi hui ge jiu ba, a di nin mang le ti dou fa (this is in shanghai dialect)
(foreigners like to play in bars, and chinese from other provinces are busy in working in barber shops)