A fifth grader looked downcast, so her teacher ask...

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 his once I`ll let your 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