Someone in the USA needs to create a fake sarin gas attack video that looks real to prove they can be hoaxed

Someone in the USA should create a fake sarin gas attack video that looks real to prove they can easily be hoaxed.
This will prove to people that it is possible to make a fake event that looks real on video to the viewers, all the while it is completely fake and no one was harmed.
They can use shaving cream on the faces as foam, and instruct the children to act out fake convulsions and play sick.