Frozen over coke bottle

So on my way to work I saw this:

Perfectly frozen over, an empty coke bottle.  This was underneath a bridge I walk under facing towards the north and which is still incredibly icy despite some warm weather we've had.

You can see how the ice is uneven towards the bottom of the picture, that's because the water dripping from the bridge snow melting and a lack of sunlight ever hitting this part of the bridge creates some strange bumpy ice textures.