Copyright and Fair Use LR

Q11) When I first read this I thought I knew the answer right away, it had to be illegal. I just thought about a class taking a video someone else had created and completely altering it so that they were in it, and with the intent of making fun of the people. I didn't think that there was any way it would be allowed. I would have liked them to provide a better explanation as to why it was legal rather then just saying video can be pulled into multimedia projects. What if the students wanted to share what they created, would it be legal for them to post it on the Internet? I'm just not sure how you can get away with modifying someones original creation and making it into something of your own, I suppose the only reason would be because they weren't publishing it or distributing it anywhere.