Trying to stab a pig!

[Khyrpa]

Grab a dagger ("ceremony_knife_1")
Take out the dagger and prepare it (use it through your inventory)
Take a touch at the pig with the dagger (use it to the pig)
The dagger hits the pigs flesh physically (AddUseItemCallback)
Blood spills around and it makes noises (CreateParticleSystemAtEntity, PlaySoundAtEntity)
etc.

search the stuff from engine script page

doubt that makes any sense... This should:

void OnStart()
{
AddUseItemCallback("", "ceremony_knife_1", "pig_corpse_1", "pig_stab", true);
}