Well, a pub crowd can be a bit hard I guess. Maybe if they put up an old Yamaha keyboard instead of all those ancient pianos it would be a bit easier. Then people could do the one finger synth pop themes from the eighties and get more direct access to the hazy brains.
I was sitting at the piano (as I do a lot these days when the need for useless activity comes over me) and started playing this fine theme from a British TV show from the eighties. Can't say I remember much about the actual show, but the simple song stuck...