Kazoo made of plastic
The kazoo is a simple but very nice/funny instrument.
The instrument consists of a metal or plastic tube with a paper membrane in the wall. By singing or humming a note with the kazoo in your mouth, the membrane vibrates and the sound is distorted and amplified.
The kazoo should be played on the wide side for best results.
The principle of the kazoo has been used in musical instruments for centuries.
At the kazoo, techniques of playing the harmonica can be applied, and effects can be created by moving the outgoing part of the pipe with both hands.
So it's a fun exercise!