"Don't ever stand on a grave after dark", one of the boys said. "The person inside will grab you. He'll pull you under."
"That's not true," one of the girls said. "It's just a superstition."
"I'll give you a dollar if you stand on a grave," said the boy.
"A grave doesn't scare me," said the girl. "I'll do it right now."
The boy handed her his knife. "Stick this knife in one of the graves," he said. "Then we'll know you were there."