Pedestrian!
I scream "Pedestrian!" when I see people walking while riding shotgun, because my first husband was loosing his sight (due to juvenile diabetes). He still insisted on driving so I was his co-pilot. I got remarried after the diabetes took his life and I still have the habit of yelling "Pedestrian!" while my husband is driving. I explained to him the history of why I do that and he said that he thought that I was just pointing out targets. :) :) :)
