Okay paper-freaks, origami-hounds, index-card-snippers of all shapes-and-sizes.

I've found a lead for you!
With precisely placed snips, you can cut a hole in a 3x5 card that’s big enough for you to crawl through!

Check it!   (but don't get hand cramps!)

http://krampf.com/experiments/Science_Experiment11.html

If you must crawl through it, I advise using knee pads - hee hee!

Math lovers will LOVE this one:   http://krampf.com/experiments/Science_Experiment4.html

a very neat-o trick!