At Xtranormal they say if you can type you can make movies, just like this one.

Xtranormal enables you to type dialogue into a "script box" for your up to two on-screen characters. You can also program movements, the change of camera angles, background music, and even the voices and appearance of the characters themselves.

To get started you might like to to use the Xtranormal Beginner's Guide.

GoAnimate for Education and ZimmerTwins are two other excellent animation creation sites especially as Xtranormal now charges for all but the most basic of services.