Step Through an Index Card

Here's a challenge to throw at your students: Hand them each an index card and a pair of scissors and tell them to find a way to step through their card (their whole body needs to pass through the card).  [You could use a piece of paper instead of the index card, it's just not quite a dramatic.]

Here's how it's done...
(Well, one way it can be done.  I wouldn't be surprised if your students came up with another). 

Fold the card in half, length-wise.

Make cuts, as shown below.

Unfold the card and cut along the fold.  BUT, do not cut the two end sections!!

Gently pull the card apart and you'll have a loop you can step/pass through.