Minding my own business on my computer, and all of a sudden, I have an 8-legged visitor (and a sizable 'smart one', as I call them). One WTF was that I wasn't terrified as usual (got over my fear a good time ago), but I was taken aback at the sight of it casually walking across my desk. That's the first WTF.
Failing to get it out my usual ways, I think that has to qualify as a "What the hell am I doing?" moment. I took a spare mouse and rapidly started clicking as a way to communicate with it (or curse it out in it's tongue). Kinda inspired by the thought that why they keep coming at me towards my machine, especially towards the speakers, mouse, and keyboard first (on top of the desk, not from below; a better blind-spot), is because of those very devices. Rapid clicking and other odds and ends frequencies flying around acts like a siren's song to them, and they just home in towards me if within earshot. So why not? Let's try it out.
I dunno what I said through the random mouse clickings, but I haven't seen the spider return yet. Must've sounded like a mad man or a chimera of species, or it was terrified that I was talking like it with the patterned and erratic clicking going on. I see it again, I'll see if I can tell it to get away so I won't have to crush it via clicking. I can imagine seeing a curious giant trying to speak like us would be rather disconcerting. Happy Halloween spider. Now get out.
EDIT:
Okay, so maybe it's no longer hanging out around my desk anymore, but yeah, I definitely had my own "What the hell am I doing?" moment there. Now I feel silly for having to resort to doing that to coax a spider into range.