I'll speak slowly for the trolls and nitwits and the head coach
There are three reasons putting Rex Grossman in the game, even for a play, is a bad idea:
1. There is a better quarterback on the roster. His name is Donovan McNabb.
2. The better quarterback is healthy.
3. The better quarterback is under contract for 2011.
These reasons notably do not include any discussion of Rex Grossman's ability or standing, nor of the price paid in trade for Donovan McNabb, because both are moot. Mike Shanahan has officially turned a segment of Redskins fans to rooting against their team just to be sure he gets the point. Nice work genius.
Donovan McNabb: Reuters Pictures from here.