I've done two that went down pretty well.
Once on the safari suit pub crawl I did Glen Campbells 'Rhinestone Cowboy' in a leary drunken Tex Perkins style with a few adjusted lyrics.
Got a good reaction from the equally drunken crowd.
The other was in Cairns after an Old School Skate Comp.
i sang the Old 55 hit 'On The Prowl' cheered on by a dozen greaser skaters from Brizzo.
Mosh pit and sing a long formed at the front of the stage towards the end.
hehe! good times!