Have you seen on QVC or one such channel, the Jack Lalanne Power Juicer?
This thing is advertised as being
"Whisper Quiet"©... but then during the infomercial Jack and his wife power one of these things up to demonstrate it. I can only describe the noise it makes as something that you'd expect to hear in the Texas Chainsaw Massacre

Quite how that's "whisper quiet" is beyond me