There were some buildings, and they could walk. 

Then there were some vampires. One of the vampires bit the tallest building, and his fangs fell off. Then all of his other teeth fell out, and he started crying.

The other vampires said, “why are you crying? Aren’t those just your baby teeth?”

The vampire said, “no, those were my grown up teeth.”

And then the vampires knew that he couldn’t be a vampire anymore, so they left him.