Christian Vampire?

At lunch the other day Caleb and I had the following conversation:

Caleb (as he holds his hand on his chest): "Do you hear that?"

Jade: "No, what?"

Caleb: "That is my heart making noise."

Jade: "Oh."

Caleb: "That is Jesus in my heart making noise! He is getting blood for me to drink!"

Jade (thinking where on Earth did this kid hear about vampires?): "What?! We don't drink blood."

Caleb: "But on Daddy's back the cup has blood in it, Jesus' blood, that's what Daddy said?!" (Emman has a tattoo of a cross with the communion elements at the base on the middle of his back)

Jade (relief and embarrassment) : "Oh! Yes, you are right. The cup on Daddy's back symbolizes Jesus' blood."