Half-Life 2

When you enter Dr. Kliener's lab, there is a largeamount of items that you can just pick up and toss around: books,boxes, computer monitors, a mini cactus, and Dr. Kliener's clipboard with the information for your Hazard Suit on it. If youtoss things around the lab for long enough, Dr. Kliener, Barneyor Alyx will say something to you:

Dr. Kliener: "Oh, do be careful."; "Careful."; and "Oh dear."

Barney: "Whoa, careful." and "You're pushing it, Gordon."

Alyx: "Careful." and "Take it easy, Gordon. "

Note: It will take a lot of attempts to make Alyx, Barney or Dr.Kliener say something -- be patient.

• After the credits, wait to see the headcrab, Lamar, being pursued by the scientist. Then, watch him pounce on your head.
  

• After you complete the game, watch the credits. Note: They cannot be skipped. When you reach the end of the credits, you will see Lamar jump onscreen. You will then hear Dr. Kliener say, "Lamar? Blast that little… Where did she get to?" This is the same thing that he says when you first see him looking for her. Lamar will then lash out at you and supposedly "couple with your head".
  

To kill the Barnicals, let them pull you up, than hitthem with a crowbar from a short distance.

If you find it difficult to hit the Striders (or anyother enemy) with the RPG from far away, fire a rocket and immediatelypress [Zoom]. You will automaticallyzoom in like normal, but will still have control of the rocket.This helps in the later levels when you do not want to get tooclose to the Striders, or other enemies like the Combines.

Take something like a barrel, chair, or another objectwith the Zero-Point Energy gun. Enemies cannot hurt you when theyare shooting you. For better results, crouch when you are defendingyourself.