Green Bay police say three men in a car spotted an elderly man going to a grocery store on his motor scooter early Thursday morning and apparently decided to rob him.  They stopped their car, got out, demanded the man’s money and hit him in the head when he didn’t move fast enough.  That part of Green Bay is home to several senior apartments and people living nearby say it’s not unusual to see residents riding those motorized scooters, even in the middle of the night.  The grocery store is open 24 hours-a-day.  The victim’s name hasn’t been released.  He was shaken up, but is expected to be okay.