Talking of eye-catching walk-offs, Annie Lennox fled from the stage during her Boulder gig after spotting a bloke wearing a gas mask and a cape in the crowd.
It's not known if other Grumbleweeds characters, like the poor impression of Jimmy Saville, were also in the audience with Wilf 'Gasmask' Grimshaw.
Lennox is pretty pissed by it all:
Oooh! A fucking apology, mark you.
This was Boulder, of course, home to Mork and Mindy; you surely have to expect that sort of thing.
We now look forward to constitutional experts debating if the right to wear gas masks to theatres is on a par with bearing arms or shouting 'fire'.