That famous Boris Johnson temper

What Boris Johnson said to Ken Livingstone in a lift after the LBC debate this morning:

“You’re a f**king liar. You’re a f**king liar. You’re a f**king liar.”

Does that sound like someone who is relaxed with their performance? In control? Comfortable?

Update: Ken’s team have responded to the outburst:

“Boris Johnson lost his temper because he lost the debate – he talked about cable cars not cutting fares and the squeeze on Londoners.”