Deputydog posted a great selection of “13 of the worst fake accents in film,” including YouTube clips where available. Readers have suggested dozens of others in the comments, which is where you should post your “nominees” too! From the Deputydog post:
keanu reeves – dracula
i was tempted not to even mention this one due to the fact that heâ€™s not an actor. itâ€™s just a given that heâ€™ll never be able to imitate someone with an english accent because he canâ€™t imitate anything unless it has no emotion, voice or physical presence. and to say yes to the part after finding out the gary oldman is gonna share scenes with you and make you look even worse is just acting suicide.
dick van dyke – mary poppins
thereâ€™s a reason why dickâ€™s performance in mary poppins is always mentioned when the subject of shit movie accents is brought up: because itâ€™s absolutely hilariously bad. if the director had said to him before the film, â€œlisten dick, i want you to do a comedy cockney accent throughout filming. donâ€™t take it seriously.â€ he still couldnâ€™t have done a worse accent.