The Master Mantra: this mantra is saying a thank you to the Guru/Master/Teacher. It can be chanted anywhere, anytime and at any place. (incase you forget any of the other mantras in the middle, this mantra comes to your rescue.) :-)
Gurur Brahmaa
Gurur Vishnu
Gurur Devo Maheshwaraha
Gurur Sakshat Param Bramha
Tasmai Sri Gurave Namaha
Tasmai Sri Sri Gurave Namaha
Om Shanti Shanti Shantihi