Last week in the Eagles V Cowboys game the Cowboys fumbled the opening kickoff. Several Eagles jumped on the ball, there were no cowboys in the vicinity initially and an Eagle came running out of the pile holding the ball. The officials initially ruled it a non-fumble, then when challenged ruled that it was a fumble but they couldn't be sure who recovered so Cowboys keep the ball.
Arbitrary is right.
In all the years I've followed Football, that is the single-most stupidest thing I've ever heard of.