I also remember seeing a shit local band in the late 80s giving it the whole U2 / Simple Minds stadium gig posturing in a pub for a free gig in the upstairs bar. The singer literally straight-faced did that ‘divide the crowd and see who can cheer/sing loudest’ thing when there was myself (pausing on the way back from the bogs) and two other guys in the room. It was like the opposite of crowd interaction, pretending there was a crowd there when there wasn’t. They weren’t even a sixth form/kiddie band, this was grown adults.