One of the most famous examples of alleged subliminal advertising is the case of a movie theater in the 1950s that was said to have flashed the message "Drink Coca-Cola" on the screen during a film at a rate too fast for the viewer to consciously perceive it. This example, which was never confirmed to be true, led to a great deal of public concern and controversy over the use of subliminal messaging in advertising.
It is important to note that scientific evidence for the effectiveness of subliminal marketing is limited. Most studies have found that subliminal messages are not powerful enough to have a measurable impact on consumer behavior. Some studies have even suggested that subliminal messages might actually backfire, by making people more resistant to the ideas being presented. Furthermore, the use of subliminal messaging in advertising is generally considered to be unethical and is often prohibited by industry standards and regulations.