People with little teeth marks who live forever. Elevated levels of spookiness year-round.

We didn't need to, we had official letters from the Vampire Provisional Government that they're packing up and moving to (what we today call) Romania.

(That's also historically the first recorded incident of organizational rage-quit after losing the game to a cheese strategy.)

We already have vampires in Romania, they're call politicians and they have their fangs firmly attached to the public purse and instead of your blood they suck your tax money.

Classic methods such as blood sucking wounds on victims or witness reports of hearing Toccata and Fugue in D minor playing in the background suddenly.