What is fun?

The toy I brought to class was a wooden frog instrument, basically it could serve as a decorative piece, a toy, and an instrument. How it works is you can remove the wooden stick from its mouth and when rubbed against its back it makes the sound that resembles a frog. I noticed that many people were confused about how to use it and needed explanation on how to play with it. The frog is fun because it is engaging and it gives feedback of sound.