The Speechbreaker campaign, created by Lean Mean Fighting Machine, is aiming to cause a stir in political circles.
The site lists dozens of words used in the leaders' recent conference speeches and allows people to drag them into a video which they can then .
But the campaign is likely to cause controversy as people have the option of making David Cameron say a four-letter word that nobody's mother wants to hear.
While it's easy to make fun of Brown and Cameron through , by making them say things like "", the only available option for Lib Dem leader Nick Clegg is to say "Choose the LIberal Democrats", which is then followed by rapturous applause.
Tom Bazeley, founder of Lean Mean Fighting Machine, said the agency was up all night taking apart Cameron's speech, which was delivered at the Conservative Party conference in Manchester yesterday.
"We wanted to do something provocative that would break in to the political circles," said Bazeley. "The LIberal Democrats don't have as much clout or as much media budget as the Tories and Labour so we had to think a bit smarter. We wanted it to prick up the ears of the hundreds of political bloggers and national press."
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