A slipper really. Depending on your point of view.
This is my first instructable (That's a guarantee it's going to be lame)
I took the piccies with my Camera Phone and Photoshop'd them best I could.
Step 1: Step One: Materials
Thing's you'll need:
-Your foot (Not somebody else's! Unless it's for them, then go ahead.)
-A roll o' Duct Tape (Bigger Duct tape makes it easier, really.)
-And lastly: A plastic bag.
Tool (Not pictured):
-A Knife (Unless you're really good with scissors, and also optional)
-Some string (Optional, really)
Step 2: Plastic Bag!
Place foot inside the bag. Congratulations! You made a Hobo-Shoe! But we're just going to go ahead and.. add more steps and make it more.. complex...-ish.
Step 3: Wrap and Prepare to Duct Tape.
Now that your foot is in the bag, wrap the opening with about two long strips of duct tape.
Step 4: Duct Tape!!!
Now.. duct tape the Hell out of your foot! But not too tight. Your foot doesn't want to get stuck in that bag forever.
It should look like the piccie below.
Step 5: Sort of Finished.
Now duct tape the parts of the bag that are sticking out. After that you need to cut a little "V" shape in the top of the opening (so that you can put your foot inside!)
Now you're done with the "Slipper" but you can also see the next step.
Step 6: Alternate Endings.
You can always make it like a real shoe and cut a big "U" down the middle and cut holes in the flaps. Then add string and make a real hobo-shoe!
Good job, you hobo.