Board Thread:Off-Topic Discussion/@comment-35301431-20170314133630/@comment-24889894-20171011085749

Fidget spinners. They come in all varieties. Some blink, some explode, some take calls.

https://www.theverge.com/circuitbreaker/2017/10/10/16452112/phone-fidget-spinners-chilli-international

At this rate, I fully expect someone to build a version which powers a dynamo and sings Miku songs as long as you keep spinning it...