This article is from the The Complete Guide To Hack Stand-Up Comedy, by Steven Rosenthal and Steve Silberberg (firstname.lastname@example.org) with numerous contributions by others.
This one's more typical of the Midwest I hear. A comic gets into town and
asks where the big construction site is. Then he/she gets to relate by
using his/her old jokes about the "Men Working" sign ("They should change
the sign!") or the Slow/Stop sign ("That describes how they're working!").