Misinformation effect example

In a famous experiment, participants were shown video footage of a traffic accident. Then participants were asked several questions about what they had seen.

• Some participants were asked, "How fast were the cars going when they hit each other?"
• Others had a subtle word change introduced, "How fast were the cars going when they smashed into each other?"

When participants were asked a week later if they saw broken glass, the first group correctly answered no. The second group were more likely to believe they had seen broken glass.