Supernatural2005

Sam Winchester:
Dad, we don't even know what these things are yet.

John Winchester:
They were what Danny Elkins killed best... vampires.

Dean Winchester:
Vampires? I thought there was no such thing.

Sam Winchester:
You never even mentioned them, Dad.

John Winchester:
I thought they were extinct. I thought Elkins and, and others had wiped them out. I was wrong. Most vampire lore is crap. A cross won't repel them, sunlight won't kill them, and neither will a stake to the heart. But the bloodlust, that part's true. They need fresh human blood to survive. They were once people, so you won't know it's a vampire until it's too late.