Neil Thapen's Pink Trombone is a voice simulator: instead of telling it what to say, you individually move the soft and fleshy parts of the mouth, tongue and throat. There's a lot of fun to be had moving around the circular purple tongue control and the bottom lip and hearing the machine sing.
https://twitter.com/pishtaq/status/843214889846018048
Spotted via Bennett Foddy, which made me think there should be a version controlled with the Q W O P letters, named "Qwopera." https://twitter.com/bfod/status/843222520677515264
