Do you think you’re pretty observant? There’s one way to find out. Click on the video link above. Did you get the correct answer? If you did, congratulations! But the more important question is: Did you notice the man in the gorilla suit? In Simons and Chabris’ famous awareness test, subjects were asked to count how many passes occurred between basketball players on the white team. In the middle of the test, a man in a gorilla suit walked onto the court and stood in the center before walking off-screen. The study found that the majority of the subjects didn’t notice the gorilla at all, proving that humans often overestimate their ability to effectively multi-task.