I used to know football

I haven't played pro's or the highest levels, but I like to think I have a damn good grasp of the game of football.

The NFL, however, I just don't seem to understand.

So, why can't we challenge a fumble ? I heard the announcers say the play wasn't a challengeable play.

So, if the defense gets an INT, and it's a defensive lineman, and it's an away game at GB, it's dark, and it's a new moon.....we can't challenge an obvious fumble.

WTF ? Pete was on the sidelines raising hell, but he wasn't allowed to challenge that call. What am I missing ?

Can't challenge a turnover because they are already reviewed automatically.