When you say something in another language, the person you are speaking with has to stop and consider the words you have said and figure out what they mean. This causes them to focus on the actual words “please” and “thank you,” and can make them more powerful. In Spanish, please is “por favor,” and thank you is “gracias.” In French, please is “s’il vous plaît” and thank you is “merci.” And if you want to try a more exotic flair, in Russian, please is pronounced “puhzhalsta” and thank you is pronounced “spaceeba.”

Source:  People of our everyday life