Stop and take that picture while you have the chance.
I'm finally learning my lesson after missing a few shots that I can never go back and get. If you see a good shot, stop and take it. There are several occasions where it was cold, or the traffic was bad, or a million other excuses I came up with kept me from stopping and taking what could have been a good shot.
This is a photo of what used to be one of my favorite piece-of-crap buildings to photograph. (Kamil has noticed my fixation with windows) :0) Taken with a Minolta 16 II on Fuji Super HR Microfilm.
Here it is now. I'm very glad I took the time to stop before. Taken with a FED-5 on Fuji Sensia 100.