Reminds me of an amusing incident in my teens

back then I started work for a firm of Shopfitters & we were refitting out an old shop which had a pianola which is also an autoplaying piano, you sat on the stool & worked the two pedals & the piano began to play via a perforated paper roll inside the cabinet, the correct keys also went up & down as it played.
We pushed it up to the door & I started to work the pedals & give the impression I was pressing the keys & before long a crowd had gathered watching the 'amazing' piano player
I presume there was a flywheel inside because when you stopped working the pedals it carried on for about 1/2 a minute so you can imagine the looks on their faces when I stood up & walked away & the music carried on
