Are you thinking perhaps of this [1] PyCon talk by Tavis Rudd, who had RSI and a rotator cuff injury? He demos a voice command system that's all short nonsense syllables, including with a few humorous video clips interspersed, and then explains it after the demo.

[1] https://www.youtube.com/watch?v=8SkdfdXWYaI (demo starts 9 minutes in)