On a package holiday to Spain, six couples turned up late on Saturday night and found their hotel overbooked.  There were only five rooms available.

The manager had a brain-wave.  He took the first couple to the first room and asked another couple to stay with them while he sorted things out.  Then he took the third couple to the second room, the fourth couple to the third room and the fifth couple to the fourth room.  He then returned to the first room for the sixth couple and put them in the fifth room.

So every couple had their own room an were quite happy - or were they?