As you know, Samurai(侍) is old Japanese warrior with Katana(刀), Japanese sword. Some people in other countries seem to believe there are still Samurai in Japan though they don’t exist anymore.
When Samurai existed in Japan, they had their own words which still alive in current Japanese. I picked up an example of Samurai word here.
“Katajikenai (忝い)” means “Thank you”. This is very dignified word. In formal occasion, not women but men rarely use this word to show big gratitude to someone. In informal case, this word is used among friends, sometimes for joking. My Ireland friend uses more “Katajikenai” than “Arigatou” to make Japanese people laugh.
If you have any chance to meet Japanese people, try “Katajikenai” to them, and they will give you a smile!