Half-Life: Opposing Force Easter Egg - Mistery Egg Eye Producter Face

In the moment you get your teleport gun, you press right mouse button and you'll be teleported into the training area were the electrical mobs will be trying to attack the hologram. Break the glass to your right and you'll get a teleport to get out but in that place you'll see a board of pics in the wall with a foto of one of the producers face with an easter egg in the place of his eyes.