To go berserk on the bong that you must hit in order to open the first doors in ZA press either left or right, your character will hit the bong with an increased speed, its not client side, everyone can see it.
If you hit left,right,left,right,le... your character wont move around and you will hit the bong like a madman, funny to trick your friends and not give away the secret on hows its done