chicken

TEACHER : there were 3 chickens walking in a line. The first chicken said that "there are 2 chickens behind me.“The last chiken said that “there are 2 chickens in front of me.”
The chicken in the middle said that” there are 2 chickens in front of me and 2 chickens behind me.

STUDENT : but howz that possible?

TEACHER : cuz the chiken in the middle was lying.