I really don't know a good answer but maybe there are some people that can fake it or really vomit for you. I know when i was at UH I ate to much one day becasue i was skinny and my freinds were telling me i should just eat as much as a can ... i really ate way to much that day. I sat down outside and did the most exceelent projectile vomiting I had ever seen. I think it shot out about five feet or more in a steady stream for a few seconds. I think I ate about four plates of food for that one and, no, i would not be willing to give it a go for your movie.