Gandalf and Bilbo - The Adventures of a Bear

Gandalf and Bilbo go to meet Bjorn, a man who can change into a giant bear. Gandalf pretends there are only two of them when he tells the story in such an exciting way that Bjorn actually finds it's funny. He feeds them and lets them stay in his house with them. And then he says, you know, when you go to bed, I'm going to go outside, so don't go outside at the end of nighttime.