Originally Posted by M&M Guy

Have you ever had a ball go OOB in front of you, and you're not initially sure whose ball it should be, and before you ask for help you see all the players start walking to other end of the floor? They know whose ball it is...

It's not a 100% accurate barometer, and it doesn't happen every game, but there really are instances where a player can indicate whether or not you got the call right or wrong.