The most incredible part of coming to work these days is sitting by a window. So when the rain starts in a distant corner of the sky visible through the window, you can see the landscape start to gray out. Tall buildings, trees, highways - all gradually blend into the vast gray rainy backdrop until they disappear.
And suddenly, you see drops hit the very window you're at. And you know it's here.
Happiness, I think, is just this.
(Of course, there is the chance that you're home at the very same time, curled up with good music, a book and a cuppa tea in hand. But let's not get carried away, shall we?)