I just posted another DIY-trap page, this one an exploding-cap trap for a drawer. This is what I’d call a third-level trap: it takes a bit of dexterity and knowledge to disarm, but anyone with a little experience shouldn’t have any trouble getting past it. I never sent this one off to Jay; it just sits on my shelf to surprise visitors who haven’t learned to be careful when opening boxes around my place.
You can browse through previous traps at my Traps Gallery (I’ve only posted a couple so far, but more will be coming).