For hardware, other devices can generate interrupts like when putting on AirPods, it automatically syncs with the music app and the banner pops up on the interface indicating that it has been connected. In this case, the music app was being used, and it is interrupted by the bluetooth settings UI. Or as in YouTube, the messages like “press ESC to exit fullscreen” or “press spacebar to pause and start” pop up on the interface as well. Every keystroke itself generates as interrupts in this UI. I would use interrupts as part of the interface by different components such as banners, notifications, or a floating button, and add animations when appearing and exiting to make it look as smooth as possible for the user and not to make them feel annoyed by sudden interface changes.