The present moment is filled with joy and happiness. If you are attentive, you will see it..
– Thich Nhat Hahn (Vietnamese Zen Buddhist monk, teacher, author, poet and peace activist)
When I think about a moment, I always think of something good. I guess I think of a moment to be savoured. Meanwhile, a moment can be any point of reference in time, any particular occurrence can be a moment. But as the above quote says, you just need to pay attention and you will find the joy in each moment.