Stone-cold bread
Every country has at least one unique form of bread. In France, they have baguettes. In Italy, ciabatta. Here in the US, we have highly-processed bread made of bleached flour stuffed with so many preservatives that you can’t even taste the wheat. As for the Finnish, their staple food is ruisleipä, or rye bread.
As you can imagine, thanks to the ultra-cold climates in the Northern European country, it doesn’t take long for bread to go rock-hard. You could playfully toss a loaf of ruisleipä at someone and get charged for involuntary manslaughter. Just look at what the loaf did to that knife’s handle.