Please remove

[eagledude4]

"Calls a function when two entites collide"
If you move as the player and hit any part of the chest, then it should trigger. But not on interaction. So you might be better off with:

SetEntityPlayerInteractCallback(string& asName, string& asCallback, bool abRemoveOnInteraction);
"Calls a function when the player interacts with a certain entity"
You can also set that inside the level editor with the entity properties.

Before I seen you're reply, I tried SetEntityPlayerInteractCallback("chest_small_2", "TriggerSpider", true); but that didn't work either.

Do I just insert the name of the function in the PlayerInteractCallback field? Just "TriggerSpider"?
I've never used the script functions inside the editor, does it change anything in the .hps file itself?