The forward progress of the quarterback, which is usually where a quarterback starts moving backwards.
When the defense tackles the quarterback behind the line of scrimmage for a loss.
joe Montana
Brady Quinn
No. This rule only exists in the NFL.
Warren Moon, NFL quarterback between 1984-2000, fumbled 161 times during his career and holds the NFL record.
brett farve
Brett Favre
theisman
The NFL record for most rushing yards in a single season by a quarterback is 1,039, set by then Atlanta star Michael Vick during the 2006 season.
Any player on the opposing teams defense is allowed to sack the quarterback.
99-yards is the NFL record