Youngest son has created his own “Gronk-a-phone,” which consists of a length of plastic hose from an air mattress inflation kit, with optional marble inside (or some water in the lower loop) to give it some vibrato. He prefers practicing with it to practicing the piano or clarinet. The instrument’s name was given by his mother, and is onomatopoeic.
This morning he added a little sea-anemone-like finger puppet to the far end of the hose. When he blows it inflates, and when he sounds his instrument the tiny tentacles vibrate amusingly; even tickle a bit.