Was I knitting under the influence? In a sense. I happened to be watching a particularly intense episode of Stargate Atlantis and apparently slipped as if to purl when I should have slipped as if to knit. Shame on me for not paying closer attention to what I was doing!
I have decided to leave it as it is, because I'm afraid I'll do more damage than good if I try to rip it out and start over. The rogue purl stitches on my toes will forever serve as a stern reminder to never underestimate the power of the Kitchener and the cardinal rule to turn the TV off before you attempt. Lesson learned.