What, in the name of holy smoke, is Boris on about?

I know Legoland. Been there. I know those "whirly teacup things". They're in the photo above.

But they are for tiny kids. It is an exaggeration to say that they "subject the human body to the most extraordinary stresses and shears". We're not talking about Oblivion or Nemesis at Alton Towers here. They go at about one m.p.h so as not to upset a three year old who's just eaten an ice cream!

So the whole premise and logic of Boris' statement seems fundamentally flawed.

But what the Sam Hill has this got to do with seeking to convince Londoners that he can run London?

Is he trying to explain how to lose an election for the Conservatives which they ought to win?