In the immortal words of that slowed-down Mary-Kate and Ashley Olson pizza-making video, when does a dream become a nightmare? This is the question addressed by justly celebrated young cartoonist Michael DeForge, in the context of your friendly neighborhood Spider-Man no less, in his cheerfully unauthorized, thoroughly unpleasant Spider-Man comic “Peter’s Muscle,” which you can now read online in its entirety at Jordan Crane’s webcomics portal What Things Do. Spinning out of the infamous (and in-continuity!) relationship between Aunt May and Doctor Octopus, the story finds the Wall-Crawler recounting a disturbing dream that starts with finding a face underneath a membranous sidewalk and somehow only gets more uncomfortably intimate from there. With any luck, a full-color edition of this strip will anchor a future Strange Tales installment, but for now, this will more than suffice.