Every time a receiver drops a pass or someone gets beat, they look at an official and signal for a flag whether there was a foul or not. On the Saints kickoff return, a coverage player for the Raiders got planted on his *** with a hard, but legal block, and was pissed because he didn't get a flag called. Players signalling incompletions bugs me, too. Let the damn officials do their jobs. They are standing still watching everything happen. If there is question, there will be a challenge... but you look stupid when a receiver makes a good catch and is clearly in bounds and a defender is complaining because he thought he was out of bounds or wants a flag for something.
Rant over.
Rant over.