Fold a piece of computer paper in half lengthwise.
Cut slits along the folded edge of the paper about half an inch apart. Cut the slits almost to the other side, but stop before you cut through the paper.
Turn the paper around. Now, cut slits in the paper between each slit you've already made. Again, cut until you get almost to the edge, but do not cut through the paper.
Start opening the paper and skip over the first set of slits. Snip apart the second set at the middle fold, so the paper can open more.
Keep moving down the line, snipping the sides of the paper apart at the fold. Stop before you get to the end, leaving the last set of slits connected.
Open the paper up and walk through it to complete the magic trick.