I was running late to get somewhere, and had to cross this bridge to get there. The sun had just set and it was a bright orange sky with the city silhouetted against it, so I had to stop and grab the shot.

Edit: Also, once I uploaded this I realised the colours in the sky seemed off, and went back and had a look at the original jpeg and the sky actually was like that, noticeably darker in the corner. Guess it was just a weird haze?