There are people with good memories, and then there are people with highly superior autobiographical memory (or, HSAM). The latter is a condition in which the affected person can remember practically every moment of their life, right down to the day of the week.

Joey DeGrandis just thought of his ability as a cool party trick for a long time, until he saw a segment on 60 Minutes about people with similar abilities. Eventually he decided to visit Dr. James McGaugh – a pioneer researcher on HSAM – while on a road trip to California. Today, DeGrandis participates in many studies on HSAM, and enjoys meeting other people with the condition.

There are only about 100 people in the world with HSAM, and while it may seem like a blessing, the condition can also be seen as a curse in many regards. Jill Price, the first person to ever be diagnosed with HSAM in 2000, stated that for her, “it is non-stop, uncontrollable, and totally exhausting.” DeGrandis has also found that he has developed depression and anxiety which is likely linked to his perfect memory.