Madagascar Easter Egg - I Don't Know the Codes... Well

In the piece where the penguins are taking control of the ship (28min from beginning of movie), at a certain point one of them is jumping on the keyboard of the navigation system trying to get the access code. Soon after the boss jumps on too "Don't give me excuses, give me results": in the background you have the screen. Look carefully when the penguins are parting apart, and you will find the following sentence:

"What a piece of work is penguin"