George Clooney used to write fake notes pretending to be Bill Clinton

wrote 'fake notes' to his fellow actors, in which he pretended to be .

The 61-year-old actor — who is known for his love of pranks — was mocked by his friend Matt Damon in a speech at the

Damon told the audience Clooney used to impersonate the former president to fool his pals and also recalled an infamous gag where the Up in the Air star 'defecated' in his former flatmate's cat litter tray.

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