WATCH: Man's 'I cheated' Prank Goes Sour When Girlfriend Admits She's Been Unfaithful Too

          

Infamous YouTube prankster Roman Atwood decided to pull one of his "classic" nasty pranks on his longtime girlfriend Britney during their 5th anniversary celebration - by telling her he had cheated on her with another girl.

But Atwood was in for the shock of his pranking career when his sobbing girlfriend admitted that she too had been unfaithful.

You will love this video *lol*