One thing that I Love and used to do all the time is wander around in the middle of the night with really high ISO Film (like 3200 B&W Ilford Pushed to 6400)  in my camera and take hand held photos. Something that was only really a film thing for digital cameras only had usable iso’s of 800 maybe 1600 if you didn’t mind a whole lot of grain. Now that technology has kinda caught up I can roll around  hand held at iso 3200 and I love it!