A week later, the same people were asked to remember the film they had seen. Among other things, they were asked whether there had been any broken glass in the film. There hadn’t been any, and those who had been asked about the cars hitting one another remembered that. But those who had been asked about the cars smashing into one another distinctly remembered broken glass strewn around the road, and were surprised to find that it wasn’t there when they saw the film again.
