Boris Johnson has gaffed again, telling reporters on Tuesday that George Osborne's strategy to deal with the eurozone crisis is "crazy".
"It's absolutely crazy to think that the solution of the eurocrisis is to intensify fiscal union. We're living in a fools paradise", he said.
The Mayor of London's comments came as he lunched with Westminster journalists. But the chancellor should not feel too bad - it's not the first time Johnson has rallied against his own government's policy.
See below for a slideshow of Johnson's best blunders.