Be careful. Make sure that the syrup has only dextromethorphan as the active ingredient. What is your body weight? If you are a fairly small person, I'd suggest just chilling out in your room with the lights off listening to music. If you are larger, you might just feel weird and be especially interested in the movie. At higher doses, the movie would just be a strange moving thing in your general field of vision - you wouldnâ??t be able to discern it from anything else.