5. Harold & Kumar Go To White Castle (White Castle)
White Castle also didn't pay to take part in Harold and Kumar Go To White Castle, and give how few fast food companies would dare invest in a movie about flagrant drug abuse, that shouldn't be too surprising. The movie revolves around the titular stoners and their desperate efforts to make it to a White Castle restaurant to have the best meal of their lives. The movie's producers first approached Kristy Kreme, but they turned the offer down, so the honour eventually went to the little-known burger chain, no doubt boosting their profile massively both in the US and internationally. Though the movie goes to the lengths of putting the product in its own title - yet in the UK it's titled as Harold and Kumar Get the Munchies - the self-awareness of the placement makes it tolerable, that and the facts that a) White Castle looks freaking delicious and b) I had never heard of the chain prior to this movie.