Jumping frogs

This model is an extremely common one. It's an easy one that is widely published. In fact, it is so easy, I even made one of these when I was at a bar. Now, of course, it was launched into a glass of booze later. It is actually pretty fun to do while drinking. Since obviously origami is all about hand eye coordination.
But, nontheless, it really is that simple. Just push down on the back, and away it will go.