The other problem is getting them to look again at an unhappy event. Don't show them the unhappy pictures or the long videos of planes crashing into the WTC Towers or of the Towers collapsing. Instead show them short videos of what the first reporters said immediately after the explosions at the Pentagon and at Shanksville, Pennsylvania.
On September 11, 2001, the immediate reports on the ground told the truth. I think most people can see that it was later that the myth-makers retold the myth the way Zelikow scripted it to be remembered. This may be 2007, but when we consider the power of mythology the psychology of the average man hasn't changed in 4000 years. And when everyone in the political community believes the same myth, it becomes a parallel reality. With TV reinforcing the 9/11 myth every single day, it has become stronger than any belief system that I can remember, but we must explore ways to challenge it.