Thank you is a powerful pair of words and Thank you is the key that opens the door to happiness.
Almighty God said, first Thank my people then Thank me. We should never feel shy to say Thank you and if we say thank you, people will love you and like you more as you are a good person.
If you forgot to say thank you, it looks you bad and people feels bad also.
How busy you may be, it's always right to thank people for even small things.
We should say Thank You to our Teachers, Younger, Elders, friends, neighbors and others as you wish.
Sometime people say bad words to you and if you reply Thank you with a smile, they might think later they have done wrong and may feel sorry for their attitude.
Please don't forget to say Thank you to others.