The Paper Airplane

A fifth grader looked downcast, so her teacher asked:

- What's the problem, Carol? I hope it's not homework again.

- Well, uh, yes, it is. - replied Carol.

- I was stupid and made my homework paper into a paper airplane.

- Carol, you're right, that wasn't a very bright thing to do - said the teacher - but this once I'll let you just unfold the paper and hand it in.

- Oh, but that won't work - said Carol, looking even sadder.

- You see, the plane was hijacked.