There were 3 people walking in a straight line, one right in front of the other. The one at the front of the line says "I have 2 people behind me". The middle one says "I have 1 person in front of me and 1 person behind me" The one in the back says "I have 1 person in front of me and 2 people behind me."
How can this be possible for the guy at the end?
How can this be possible for the guy at the end?