You can't hit normies with 9/11 out of the gate, they'll immediately dismiss everything you have to say. The propaganda on that day was a deep. Where do you start when red pilling someone on 9/11, donkey? I usually start with the BBC reporting building 7 had collapsed while it was standing behind them, then move to Larry Silverstein's "pull it" comment. After that you can move on to the work crew rigging the towers with explosives and show them the squibs in the videos. Finally you can slap them in the face with the reality of physics, because the towers fell at free fall speeds.