Long Live the King
On Declare Yourself Sovereign of Your Own Nation Day, you get to be king (or queen) for a day. Sorry, this doesn't last any longer than a day. Tomorrow you'll be back in your normal state as subject of the standing government.
Also, to any official government officials reading this, please read the IAQ before contacting me.
Now back to our show....
As Your Royal Highness, you obviously can command everyone else to do your bidding without fear of remonstrance. Other people who aren't king or queen just don't get to remonstrate.
Now, there could be a problem if everyone decides to get in on this and declare themselves sovereigns. It's hard to be supreme ruler if there's no one to lord it over.
So if you want to be absolute leader for today, maybe this is a post that you don't want to share with your friends or acquaintances like you usually would.
If you decide to be the all-powerful one for a day, let me know. I'll pay you proper homage - even if no one else will.