At the end of each day I put one of my students on the bus and strap him into his seat. After I've given him his "high five for a great day" and am heading down the stairs he almost always calls out, "I love you, Ms. Lipstick."
And no matter how tired and stressed and overwhelmed I am my heart melts a bit.
It's at that exact moment that I know I have the best job in the world.