The 1980 cult movie "Friday the 13th" features a Royal Enfield motorcycle (barely noticeable in the shot I was able to get, one can see the pilot light in the nacelle). Rather remarkable since Royal Enfields were quite rare in the US in 1980.
Update 5/4/17: It appears the clip I got the image from was mislabeled. It corresponds to the 2009 remake of the movie. David Blasco has an article about it.