Note to the world's morons: you don't have to make your characters swear, however tempting it may be. Have you any idea how difficult it has been trying to find an example of a movie this side of the language acceptability threshold?
Anyway, this site is fun (for about an hour). You can make a movie just by typing the script into the box. There are other tools to animate your movie and then you can post it on Youtube.
For another fine spending-free way to pass a lunch break from This is Not Work check out: