If A Plane Is Made Out Of Paper, Does It Still Fly?

I was cutting through the brand-new engineering building on campus, when I noticed a couple of guys on the fourth floor trying to "fly" paper airplanes down into the courtyard. Of course, they failed miserably; duds, all of them.

Then some guy down in the courtyard looks up at them and yells "Hey, I hope you're not in aerospace!". Heh.

Sometimes, you gotta love the engineers.