Less than a week after Boris Johnson appeared to dismiss people with a low IQ, the inevitable has happened.
The mayor was faced with an impromptu intelligence test live on LBC on Tuesday morning - and flunked it.
"No-one said IQ is the only measure of ability", he spluttered after getting two questions wrong and refusing to answer a third.
Boris, whose Eton education was pointed out by a caller, said people were wilfully misconstruing what he had said, saying people at both ends of the spectrum needed to be helped.
"What I was saying is that there's too much inequality" he insisted.
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David Cameron and George Osborne have distanced themselves from his comments, in the Margaret Thatcher lecture, when he noted that 16% of "our species" had an IQ below 85, and said more needed to be done for the 2% above 130.
And Nick Clegg accused him of "casual elitism" and talking about people "as if they are a breed of dogs".
Defending himself on LBC, he said: "What I was saying actually is there is too much inequality and my speech was actually a warning, as correctly reported by many newspapers, actually a warning against letting this thing go unchecked because if you look at what's happened in the last 20, 30 years there's been a widening in income between the rich and the poor, there's no question about that.
Boris also struggled to name the correct fare for a tube journey between Whitechapel and London Bridge, after TFL announced a fare increase.
There was silence on air as he appeared to rummage through paperwork before saying £6.70, which was wrong.