Real event OCD centers around actual memories of specific experiences. While no one's memories are 100% accurate, the memories involved with this form of OCD are based in reality. False memory OCD is a kind of OCD in which a person has intrusive doubting thoughts around past events. For example, a person may worry they have hit someone with their car while driving sometime in the past, but are unable to determine if that event really happened or was fabricated by their mind.