Judgement?

[dittoheadAZ]

and I wish I could remember the player (I've got the reference at home)

The runner slid into home plate and was tagged by the catcher. The umpire called him out. The runner said, "If I'm out, what's this?" and reached under himself to pick up the baseball, where it was lying after the catcher had dropped it. The umpire reversed his call and declared the runner safe.