Diddly, watch this cartoon... it is about three twenty-somethings with a time-traveling bathtub who go throughout history causing havoc by bringing people from the past into the present (sometimes including themselves).. this time around they bring Elvis... the part for you to listen for is what Elvis says when they wake him up on the crapper when they first go back to get him.. its relevant to YOU specifically ;P
These have actually been around for a few years now. They work in a similar fashion to those vacuum cleaners that wander the room at random, changing direction when they encounter an obstacle. They use an electronic fence which is buried around the perimeter of the yard to determine boundaries.
Yeah, I mean granted he probably couldn't walk in a straight line, but he could walk. I would think though he would still be in a lot of pain. Internal organs don't respond well to be repeated jarring like that.