One of the oldest questions… Why did the Chicken Cross the Road?
[youtube=http://www.youtube.com/watch?v=WS2E-94NdWI]
Lost in a strange forest the Doctor is confronted by a group of children who bombard him with riddles. If he doesn’t answer them correctly he might not get to see Jamie and Zoe again. Classic clip from the Mind Robber first shown in 1968.