There have been many reports of encounters with aliens, which have not been verified or admitted publicly by the government.
Despite what you may read, there is as yet no worldwide, agreed proof or evidence that man has encountered aliens. Therefore it follows that no person is known and proven to have had a first encounter.
Not that anyone knows and has proven.
Aliens are not known and proven to even exist, let alone be here and harming people.
No aliens are actually known and proven to have ever done so, so asking "how" is a bit premature.
It is not known whether any aliens EVER landed on Earth.
There is no evidence of any kind to support the idea.
There is no reason to think so. So far, there is no actual hard evidence that aliens actually exist.
There is no evidence of any kind to support the idea. NO.
If by 'aliens' you mean intelligent extra-terrestrial beings, there is no plausible evidence that any have ever visited Earth. However, with billions of planets in the universe, it would be arrogant of us to believe that we are alone, as the only intelligent life forms that ever evolved. There must be 'aliens' out there.
no
After I am dead hopefully! liedetector2000: one day my friend. one day.
Succinctly, no. Vampires are creations of paranoia, fear, superstition, and myth.