If you ever had any doubt about the ferocity of kittens, today, you shall need to look for no more proof. This tumblr thread has given us all the proof we'll ever need by explaining that Vikings - the huge, powerful, strong fighters - used to give tini-tiny kittens to their newlywed wives. And there has to be a reason for that, right?
Just looking at the pictures of the Norwegian Forest Cats is enough to understand why Vikings would give such ferocious kittens as gifts to their wives, but reading about the legend behind the custom and the real life facts about these facts is something one cannot argue against. So, next time you're considering getting a dog to protect your house, perhaps you should take a look at kittens instead.