A troll was guarding a bridge. One day, a little girl came upon the bridge and knocked on the troll's door.
"Who is it?" asked the troll.
"I am a little girl," said the little girl, "and I was wondering if you could let me pass."
"That depends," said the troll. "Do you know why I am here in the first place?"
"No," said the little girl, "why are you here?"
"That's a good question," said the troll. "I don't know."
<<< >>>