What's your most rewarding experience as a parent?

Seeing my baby happy in my company and each time when she comes to me and tells me to leave my work and spend time with her, I feel really being rewarded. I mean she literally says, "Mamma, leave your work, and spend some time with me. Play with me." I feel so elated that she thinks that I have it in me that I can become a co-player of hers. :)