Old wives’ tales

Update: I originally thought I could leave the first half of the joke out and it could still be understood. Now that the cartoon is published, it no longer seems such a good idea. But hey, it's never too late to mend your mistakes, so here is the full cartoon, as it always should have been. (Here is what it was like before, in case you're curious and didn't get to see it.)

Sure enough, there's still the possibility that the joke is really lame, but that's neither here nor there.

"Don't play around the castle! Vampires live there that will suck your blood and turn you into one of them if they catch you!"

"Alright, mom."

"Never go near the village! The mortals will make you drink their blood and you'll become one of them, doomed to grow old and die! Did you understand me?"

"Yes, mom."

Context is important

"The director had this idea of using scary stories to deter inmates from escaping."

"Looks like it could use some tweaking."

"He was warned against it, but he wouldn't listen. So, one afternoon he went over the perimeter fence and started running... and was never seen again."