Counter-Strike: Condition Zero Deleted Scenes Easter Egg - Building Recon: Police Hq

At the beginning of the level when you are entering the police headquarters a man greets you. Look at his computer. He is playing Counter-Strike: Condition Zero.

Also, before you get into the actual meeting room, look to your right. Next to the refrigerator you should see a water dispenser. Press your 'use' key on it and it will make a water sound.