I was playing a 5 hour set at a small club and i opened the new year with "Dee Lite - Groove Is In The Heart" which was completely out of place but had people screaming!!!!
every year i always drop something in the old-school cheese section last year it was "Underworld - Underneath The Radar" and the year before "Commonards - Don't Leave Me This Way". my reasoning is that it's a party night not a serious occasion, though the money is serious, LOL.....
Mind you i never take sets to seriously, it's all about the vibe in the room and i'll play most anything to get a room going!