We may never know what this cat is reacting to, but our best guess is that someone finally told him you can download the YouTube TV app on Roku, Apple TV, Xbox One, and most smart TVs. Happy #InternationalCatDaypic.twitter.com/GwJkR6ehlT
At this time, YouTube TV is available on Samsung smart TV models from 2016 and newer. We're working on supporting older models but we don't have an update yet. Here's the Help Center article on supported devices: https://goo.gl/DCF1QG . Hope this helps!