When Aaron Rodgers suffered a concussion against the Detroit Lions in 2010, the Green Bay Packers went into a shell with Matt Flynn under center. The backup quarterback completed just 15 passes, tossed an interception, and led just one scoring drive (a third-quarter field goal) before ultimately losing 7-3 at Ford Field.
Knowing Rodgers would likely not return for the following week's game against the New England Patriots, head coach Mike McCarthy threw caution to the wind and built a smartly aggressive game plan around Flynn. The Packers attempted a surprise onside kick, established a good balance between the run and pass, and played stellar defense to keep Tom Brady and company in check.