Telly people from Tellyland where strange is good

Why was Alan Yentob, the BBC's creative director, standing on Waterloo Station this afternoon alongside a woman holding an artichoke in one hand and an arm from a tailor's dummy in the other?

In Tellyland everything strange is good.

I know an old joke where the punchline is: Artichokes two for a pound at Tesco's. You need to work backwards from there.