Can you cut a hole through a 3x5 index card large enough to walk through?

I hate to say this, because it sounds so trite, but yes you can!

It never ceases to amaze me how many people don't know the "trick" (which isn't a trick at all), and I was going to make a YouTube video showing how.

But someone has already beaten me to it

That's the trouble with the Internet these days. Almost anything you can think of doing or saying, someone has done or said.