Taking a class for another

Recently at the jr college here in town this kid i heard about from a friend of mine signed up for a class and had his friend take it for him because he feared he would fail....apparently, the friend did the classs and took the final and never was called on it..... have any of you ever heard of such a thing? i was shocked that actually can be done. I figure i should of had someone do that for me in college alegbra !LOL