This computer trick is a little better

Ivan Seeking

Sure! I love this kind of stuff.
Start with a piece of clean, plain white printer paper, or a similar 8.5 by 11" sheet. The main thing is that the paper is unmarked - there are no lines. Get a pair of scissors and make a total of three cuts:

First, measure [approximately] along the length of the sheet from the end to about of the 3" and 8" points [about three inches from either end]. Now, at each of these points, make a cut across the sheet to exactly the half way point plus a about a 16th of an inch - ie 4 and 9/16 inches. [edit: make that 5/16th" not 9/16th]

For the third cut. From the other side of the page and exactly at the mid point, cut across the page again to 4 and 9/16 inches [edit: make that 5/16th" not 9/16th].

Now grab the sheet at both ends [along the length,] and twist one side of the sheet 180 degrees. This rotation twists about the midpoint and is made possible by the second and third cuts.

Now you should have a 5" flap in the middle of the sheet. Make sure this side is up. Fold this back and forth at the line that forms the intersection of this flap with the sheet. Keep in mind that the sheet should be otherwise flat [flat on the tabletop] with a flap sticking up vertically. Flatten evenly. You should be done.

Once you make clean and firm folds, the page should naturally stay in this configuration. I usually place this on a table and then tape it down securely with the flap sticking up. Ask people to duplicate what they see; but that they can't touch the example. The twist is what fools people. This is why women who sew usually spot this quickly; they think in terms of mirror images constantly. People who don't have good topological thought processes are usually quite baffled. Also, people usually either see the solution immediately, or not for some time if at all. Let me know how you do. These things are much easier to show than to describe.