Clacker

Clackers (also known as Ker-Bangers and numerous other names) are a toy which was popular in the late 1960s and early 1970s. They consisted of two plastic spheres suspended on string which were swung up and down so they banged against each other, making a clacking sound. Now you can remember the fun of your childhood in android. How many "clackers" can you do? Hold the button and shake the phone as many times as you can.