I surprised myself, I didn't scream. I think I said Oh My God and started breathing like I just ran for 20 minutes.
Since I don't mind spiders if they're outside and keep their distance (I mean, they do eat other bugs you know?) I decided to try and 'save' it. I opened the window and tried to 'help' it outside. But it didn't like that idea and it started coming towards me with alarming speed (in a room about 4 feet squared) and I swatted it. I swatted it good. It curled up in a little ball and didn't try to move again as I picked it up on the swatter and threw it out the window. But you know, spiders are really good at playing dead, so it might be alright. I didn't see it's brains or anything and all the limbs were attached.
I'll tell you one thing: I don't know if I'll ever have to pee again.