Fast and Furious 6
In one of the funniest improv scenes in any movie came from just some friends joking around. When Hobbs enters the party, Roman says to Mia "Hey Mia, you better hide your baby oil" to which Hobbs responds "You better hide that big a** forehead." Dwayne Johnson came up with this hilarious line on the spot, and it was so unexpectedly hilarious that Ludacris spit out his drink.
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