Being fairly clumsy/careless from time to time, often quite remote from civilized help, and fortunately having a pretty good familiarity with first aid techniques, I've had occasion to employ, on myself and others, self-stitching, butterfly bandages (I've used a variety of tape for that - friction tape, electricians tape, duct tape, packing tape, masking tape, and actual medical bandage tape; the medical stuff and duct tape work best, though that transparent packing tape does a pretty good job, too), superglue (stings like hell, but it works pretty good if you can staunch the bloodflow well enough and long enought to adequately coat both sides of the wound), and silicon adhesive (that stuff's real rough on body hair - real last-resort material). While I've never done it or seen it myself, safety pins (preferably sterilized, of course) will work too, according to various emergency manuals. When it comes to removing stitches from me, professionally installed or otherwise, I usually do it myself, if they're accessible. I've freed myself from a plaster cast or two also, but that's another deal altogether.
Oh, and don't recommend you try any of this at home, kids
Also, if you're injury-prone, its an excellent idea to stay up to date on your tetanus shots.