The best part about instant replay, in my opinion, is that teams are now allowed to show controversial plays on the Jumbo-tron - they used to get fined for that. I've seen it happen a few times recently where an umpiring crew will reverse a call on its own after New York has declined to...because everybody in the ballpark has watched it on the big screen from four different angles, in slow-motion, and knows the ump screwed up.