While playing Chapter 1: Point Of Contact in Extinction mode, grab the sniper rifle and find the "Gil's Lodge Motel" neon sign in the first area of the game. Shoot the letters "L", "O", and "L" (in order) in the word "Lodge" on that sign with the sniper rifle. If done correctly, the message "LOL" will appear in the center of the screen and any alien shot will temporarily explode into golden stuffed alien dolls. Note: This doesn't always work.