Fear, an emotion guided by past life. One purpose to unlocking extraterrestrial memory. We fear things because of events or death from past life. We fear things because we remember them, though we do not remember fully.
     From past life you could've died from a high fall, therefor leading to a fear of hights. The fear of clowns? This is stemmed from either childhood event, or this has been developed from a memory of you being killed by the "killer clown" that had killed children. It could be from you just being injured from someone with facepaint on. It could also be from remembering a scary event from a past life that involved an entity with a colorful and/or different face from a normal entity of their decedent's.
     Remembering what's from our past lives is a puzzle that only the open minded may unlock. Though the puzzle is not physical nor similar to any other. It can be solved by finding the emotion that guides your puzzle, defeat the troubles to get the key, and finding the lock. Although finding the lock is a completely unknown process.