"Dr Jekyll and Mr Hyde was a really popular novel, and was made into a stage play. The actor playing the eponymous role(s) was so good at switching from the good doctor to the evil Hyde that people wrote to the police claiming that he absolutely had to be the real Jack the Ripper (who was thought likely to be a qualified doctor based on the way he dissected his victims). They thought no normal person would be able to make such a transformation."
"Obrigado" is Portuguese for "Thank you."
Portugal was the first European country to really make meaningful contact with Japan, which was the easternmost heavily-populated country/region in Asia. Portugal happens to be the westernmost country in Europe.
The two words, Arigato and Obrigado, are linguistically completely unrelated.
Those two very similar words developed in completely isolated contexts on opposite ends of the world's largest landmass, and they mean the same thing."
The Portuguese were just trying to colonize Japan and failed.
You are a brazilian vira-lata. You hate Portugal because it didn't fail to colonize you...