Didn't something similar happen at Withdean when Hinshelwood cleared it and the ball boy gave it back to the opposition VERY quickly and they scored..
I think I remember people giving the poor lad abuse rather than completely ignoring the fact all our players had switched off.
I remember a ballboy chasing an airborne ball, not noticing the little hill leading up to the changing room/Portacabins, and ending up flat on his face right in front of the away fans. Something niggling away that it was against Palace as well.