As a child, I used to make a lot of prank phone calls. I don’t know how I ever pulled off most of them because I had a very youthful voice. Unfortunately, time has erased most of my memories of the specific details but I remember having a good time.
Kids today have it easy with the advent of soundboards, convenient Flash executables with canned phrases from celebrities. You can keep someone going for quite a long time with those babies. Like many things stemming from the Internet, you just have to be quick on your toes.