I almost got into a physical confrontation with a woman over this. At the local grocery store, I was waiting for her and her kid (probably age 6 or so) to walk across an parking aisle before I pulled into that aisle. I was WAITING for them. Made eye contact even while waiting so that she knew I had seen them. She made it look as though they were staying on the same side so I went to pull in. At the last second, her stupid kid ran in front of me as I was pulling in. She screamed at me to watch out and how dare I almost run her kid over. Made an absolute scene. It took every ounce of self control not to get out of my car and absolutely throttle her. I knew if I got out, things were going to go downhill and really fast. I'm not normally like that but there was something about her complete and utter stupidity that really got to me.
ETA: It still makes me so mad, even thinking about it.