back in time adventure
"I came to see some ceramics at a museum with my class, and I tripped and knocked something over, and found a thread and held it and suddenly I was here, and this place looks just like a place we were learning about, the ancient city of Lamanai in the jungle of Belize in Central America. Look, here's the thread and the cloth it's attached to."
You show the old man the cloth and the thread. He looks at it, mutters something about a sacred cloth for the Ajaw, and abruptly lunges for it.