Ask someone if they can cut out a regular size piece of paper so they can put their body through it? The paper has to be in one piece and can not use anything to hold it together. Then tell them you can do this after they can not do it.
Go to the link below for the print out of the Walk Through Paper. Cut out on the lines. Make sure only to cut the 6 pieces on the folded part in the middle, Do NOT cut the ends. Then unfold and you will be able to walk through the paper.
Walk Through Paper Cut out