Serendipity is a great word. It is almost onomatopoeic (sounding like it means). Serendipity is a happy coincidence. The sound is kind of like Zip-a-dee-doo-dah, no thought just being. Being happy.
Being alert for happiness is a good habit. It’s a shame to miss it when it happens. Any event is essentially a coincidence, so anytime you catch a whiff of happiness it is serendipity. There is no need to grab ahold of the happiness as it wafts in and out of your awareness, just recognize it as serendipity.
Serendipity-dee-doo-dah, dip-a-dee-ay. My, oh my, what a wonderful day.