EE HIT HEAD ON TOP CAB OF SUPERVISOR'S TRUCK AT QUITTING TIME. HE DIDN'T THINK IT WAS ANYTHING, SO HE WENT HOME. THAT NIGHT HE HAD A HEADACHE. HE CONTINUED TO HAVE HEADACHES & STATED HIS NECK BEGAN TO HURT. HE STATED HE WENT TO E.R. ON 4/17/03, BUT SAW HIS REGULAR ON 4/21/03, WHEN WE WERE NOTIFIED OF HIS INJURY.