useless but indispensable

Do I really need a tool to break the shell of my boiled eggs? No of course.
Yet this "egg hat" has become indispensable in my kitchen. My children eagerly await the day of boiled eggs to be able to use it because it's really fun and there are no more little pieces of shells are crisp.
With raw eggs: one cap and the top of the shell is removed, the egg is empty. The shell is filled with scrambled eggs. It's beautiful, they invited rave: thank you the "toque egg"!