Three ducklings are swimming in the lake in a row.
The first duckling says, “There are two ducklings swimming behind me.”
The second duckling says, “There is one duckling swimming in front of me, and another duckling is swimming behind me.”
The third duckling says, “There are two ducklings swimming in front of me, and another one is swimming behind me.”
How is it possible?
The third duckling lied.