Or maybe they're after people who are so desperate for a job that they'll humiliate themselves to get one, on the grounds that they are more likely to then put up with any humiliations the management decide to heap upon them later? You know, people who value a paycheque more than their dignity. Or am I just being cynical?
Being able to dance on command like a trained monkey has feck all to do with a job as a sales person in a white goods store. I'd much rather Currys recruited people who actually vaguely knew something about the stuff they're selling and had some enthusiasm about doing so like that guy had. But no, they'd much rather have 'zany' people who will do whatever the hell management tell them to do without question or objection.
Which isn't at all a contributing factor as to why they're going to the effing wall.
I'm with CW. If they'd asked me to do that in an interview I'd very loudly have told them to stick their job where the sun doesn't shine. And I suspect after one person had done so, most if not all of the other candidates would too.