Raindrops travelling down a window whilst you're sitting inside in the warmth, perfectly dry. Watching the world go by, in the rain. City lights sparkling against all the raindrops that trickle down the windowpane.
This picture was taken with an incredibly fast shutter speed so that it could quickly capture the flying water droplets. The reflection adds so much more of an interesting view to this picture; because it's as if you're seeing it double.