Click on the flag and watch the ball, listen to the horrible sounds, and, most importantly, DO NOT GO INSANE!!! If you have any existing mental conditions, DO NOT WATCH THIS!!! If you do not want to go insane, but want to see this animation, I recommend you mute the volume (or play it at very quiet levels) and not use fullscreen.
Thanks to @MidnightTheKitty for providing me with an intro.