5. Lets Mess Up This Poster - Reservoir Dogs
If you've ever read one of Quentin Tarantino's first draft screenplays (those that he types using a single finger on a typewriter, apparently), you'll know that he's not a particularly great speller. This might come as something of a surprise, given that he's renowned mostly for his writing chops - I mean, the man has won two Oscars for Best Original Screenplay, right? All that considered, I still doubt that he insisted "Lets Go To Work" appear on this awful poster (Lets should be "Let's"), which looks like it was designed by a Tarantino fanboy in half an hour on a rainy day.