Which in my example I obviously did because I logged in before the Account Migration. 
Also the Dev Setup for Forge then violates this law very hard, because THAT bypasses Auth completely.
What about the System Clock being Reset on every Reboot because of being 32 bit and not wanting to go into the second wave of the Y2K Problem? That one is definitely legitimate.
Also I once had a Computer with a broken System Clock so this can happen by accident too.