Fried egg
I believe fried eggs and bacon are known nearly everywhere in the world. Yummy!

Solution

The fried egg and bacon idea is simple and easy to adapt to the knife. The humble visualisation of the eggs yellow circle is recognizable for nearly everyone, because even you like your breakfast friiiieeed with crispy bacon :) I'm Jörn, 39, from cologne and I like it simple, especially on weekend mornings. Perhaps you might have to look twice, to get the idea of this knife design...but the very simple abstraction makes it funny in my opinion.