Interesting. Everyone I ever talked to in Germany calls it that. Everyone that I talked to about this specific thing, that is.

So what would you call it? Do you say Eierschalensollbruchstellenverursacher every time?

Most people in Germany just call it an "Eierclacker", where "Eier" means "eggs", and "clack" is the sound that it makes when the metal ball hits the bottom of the metal rod to break the egg open. It also says "clack" on the box.

But "Eiersollbruchstellenverursacher" is funnier.