Standing outside my little boy's door to go in to turn his light off, and hearing him read aloud to himself. And with my husband, watching a video of my daughter singing to herself. Felt so full of joy that I get to share in their wonderful worlds.
Most of the happiness I get now is from my children, but probably the happiest I've ever been was on my honeymoon, before they were born. I've never been more relaxed, I can't remember a bad moment of it, and I don't think I'll feel that amazing sense of lightness again.