Easter Eggs
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Valve Hammer Editor
Go To Coordinates
If you type the point 200 -4096 1154 in the Go To Coordinates dialog, a dialog appears saying:
Day of Defeat: Source
WTF
The voice command voice_wtf makes the user say Whiskey Tango Foxtrot!
Half-Life: Opposing Force
Haiku
Open the console and enter haiku to make the game put together a random 
haiku for you. All the lines can be found in the file opfor.dll.
A possible haiku