Shake screen when entering a map?

[Adny]

StartScreenShake(float afAmount, float afTime, float afFadeInTime, float afFadeOutTime);

Is what you're looking for. afAmount is the intensity of the shake; do not exceed 0.5f unless you plan on giving people seizures. afTime is how long it lasts; afFadeIn/FadeOut determine how long the screen shakes until it reaches the max effect.

Hope that helped.