The perpetrators of the UFO hoax in New Jersey have posted videos showing the way that they performed the hoax. What is interesting is that some people clearly saw that it was a hoax. The hoax was done to see how gullible people were. Using simple tools, in this case binoculars, police saw balloons drifting along with road flares dangling beneath them. Other people said there was no smoke (naked eye observations). More evidence was "definitely not a plane". MUFON says that they tested road flares and than was an implausible explanation.
Here are 3 links that show how to see if people are gullible.
