Vampire Encounters

This may be an odd topic, but is there anyone out there that has had what they believe to be a true vampire encounter?
I am extremely intrigued in their existence and whether or not anyone has actually come in contact with one.
I am simply looking for other people who may have had a similar experience like Pretty Hexxed or Paranormal Round Table:

http://youtu.be/gEuTxBijf9w

https://youtu.be/TXZwIhVq6lI


Thank you in advance!