To my horror, I discovered that the last three "shoots" on my photo were all inadvertently taken with a ISO 800 setting.
These camera makers really need to tweak the interface.
Back in the film days, you put one roll of film in. That roll had a constant ISO. You know what film you put in, so you remember what ISO you're using.
These days, it's just another setting.. but unlike any of the other settings, it's not displayed anywhere. Furthermore, LCD previews of your shots don't show that you've accidentally set the ISO too high, since the scaling down usually averages out the noise.
They really need to put the ISO setting in the view finder, or at least in the smaller LCD at the top of the camera.
Maybe the lesson is just to use the auto-ISO setting.