Note this is an archived version of this page. The current blog is now here
A man lives on the 20th floor of a block of flats. Every morning he takes the lift down to the ground floor on his way to work. In the evening, he takes the lift to the 10th floor and walks up the rest of the way. Why?
Ka Wai Tam (see previous post) also has a page on what he calls Yes Or No Questions but which I learned as Albatross stories (though this seems not to be a common usage, at least as far as Google is concerned). The idea here is that you are presented with a bizarre scenario, and you have to work out what happened using only yes or no questions.
One fairly easy example is, "A man pushes his car up to a hotel and goes bankrupt." There are lots more, so I may post a selection at some point.