Umm...ouch?

A most bizarre thing just occurred. I was unzipping my gig bag to take out my guitar, as I have an idea fresh in my mind. I restrung it two nights ago for recording, and as my usual practice, I don't cut the excess string off from the post. My guitar is ever so slightly longer than my gig bag, so I have to somewhat forcefully pull the zipper around the headstock to make a quick job of it. When I did, somehow the excess of the sixth string (the thickest gauge for those of you not in the know) suddenly sprung out and stuck into one of the joints in my left middle finger and went pretty deep. It's now dark and swollen and pretty sore. I Guess I should have iced it before playing out my idea.