A single verb changes what witnesses claim they saw.
Loftus and Palmer showed a crash film in 1974. Asked how fast the cars were going when they "smashed", viewers averaged 40.8 mph; with "contacted" only 31.8. A week later 32 percent of the "smashed" group reported broken glass – there was none in the film.
Useful: How you phrase a question changes the answer, and sometimes the memory behind it.
Source: simplypsychology.org