there is no chicken egg

A manager of a cinema regularly to a restaurant to eat ,each time did not pay after eating,but repay a debt with a few movie tickets.

One day, he went to the restaurant again and ordered a fried egg ,but restaurant owners said:"There is no chicken egg".

Manager exclaimed: "Why not have egg?"

The boss said: "all of chickens see a movie, and  have no spare time to lay eggs!"