Evidence that you are a fictional character: / 1. Regular and implausible outlandish coincidences / 2. Obvious plot holes in the worldbuilding / 3. Unusual gaps in your memory, as if periods of low narrative interest were "timeskipped" / 4. Branded or trademarked items in the environment seem lazy, hastily constructed or self-parodic, such as a social network whose posts are called "toots"