So the Prime Minister could be forgiven for not being quite so humble in victory when Chelsea beat Bayern Munich to take the Champions League title last night.
Mrs Merkel looked less than impressed as Didier Drogba hurtled his penalty past Manuel Neuer to seal the match while Mr Cameron threw his hands in the air in double fist pump.
Barack Obama, who was standing diplomatically between the two, also appeared engrossed in the game although he kept his hands firmly clasped behind his back.
The three world leaders watched the match during the G8 summit in where Mr Cameron has called for world leaders to draw up “strong contingency plans” for the break-up of the euro after discussing the European debt crisis with Barack Obama.
The Prime Minister also urged the European Central Bank (ECB) to emulate the Bank of England by printing new money to inject into the European economy.