In the good old days of the late 70's when they were playing the dives, they did a final encore medley which started with "Cum On feel The Noize, into Chuck Berry's "I'm A Rocker", into "Boney Marony", into "Whole Lotta Woman", (complete with filthy innuendo where the word "whole" loses the "w") into - finally - "Born To Be Wild". It was absolutely amazing.
You always knew the gig was finally over when they played "Singing In The Rain" over the PA.