This should be used whenever there is an internet argument.

@G.S.  
As a counterpoint, restrictions such as those you mention are only needed if said royalty would be willing to do such a thing in the first place. They’ve had the same rulers for said thousands of years, so there’s been no opportunity for bad apples to come into supreme power and necessitate restrictions (minus Nighmare Moon, who was kept in check by the other ruler anyway).
 
Given what we know in the show, it’s entirely possible that the princesses wield unrestricted power (other than with regards to each other), and they’re just too moral and benevolent towards their citizens to ever notably abuse it with things like unilateral executions (even putting aside the nature of the show). The citizens loving their rulees could just as easily be due to simple trust.
 
We have seen examples of the princesses undertaking actions that would require the participation of parliament in a parliamentary monarchy without any such group, like when Twilight undertook ambassadorial duties to the Yaks (twice) without Celestia evem knowing about it, so it’s unlikely that they are constrained by a legislature. Plus, at the end of The Cutie Re-mark, Twilight seemed to be in complete control of Starlight’s punishment (for crimes that could much more easily be justified with a very severe punishment), meaning she didn’t have to go through any court system.

@Inkan1969
 
Considering Equestria is a functional monarchy that hasn’t collapsed after thousands of years and the general populace loves their rulers unconditionally, I highly doubt that there aren’t restrictions of royalty to prevent such gross abuse of power.
 
Any major decisions the rulers make proooobably have to go through parliament. And as tossing ice cream is hardly lethal (and quite delicious), I don’t think an execution order would go through.
 
This has been your friendly neighborhood debunking of a concept that would make Twilight a bad character. Have a nice day. :)

@TheBrianJ  
Food fight was his favourite game.

“You two do realize that as a princess I could just have you both executed.”

I still love Twilight’s face in this scene!

It may have seemed strange for Starswirl to create such a specific spell, but the “Removal of Ice Cream Shield” really came in handy!

Can see the exact moment of, “This is my life now?”