Vampires- Origin is from a genetic disorder called porphyria. These people cannot form functional "hemoglobin" very efficiently due to an enzyme deficiency, therefore, these people are very anemic or pale.
Also, there is a build up of a hemoglobin precursor that actually becomes active when exposed to sunlight. This active molecule can induce severe physical pain and eventual scarring of the skin. Thus these people scream when exposed to the sun and prefer noctural activity.
It can also cause intermittent insanity.
Ghosts- We tend to see what our minds are afraid of seeing. Ever drive down the road and see that black thing lying motionless in the road ahead. We all think of our pets and think we are seeing a dead cat or dog. Then, once we get there, we see that the shape we thought was animal to be a shard of rubber from a worn tire. Usually with ghost sightings we only get that immediate "fear driven "flash" image and there is no time to observe the situation in detail as the "ghost" has gone.
Afterlife- why I drink, don't believe in it
Big Bang- ejaculation.
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