How to make a door bang when walking into an area?

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Mmkay and I was trying to figure that out earlier to. How do I make a particle system start when I walk into an area?

You use AddEntityCollideCallback, provide "Player" for the parent and the area name for the child name, and in the callback call something like:

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AddPropImpulse("door_name", -2, 0, 0, "World");
PlaySoundAtEntity("pound", "hit_wood", "door_name", 0, false);
PlaySoundAtEntity("enemy", "L02_attack", "door_name", 0, false);
CreateParticleSystemAtEntity("pound_dust", "ps_hit_wood", "door_name", false);