OCT. 4, 1992, marked one of the most infamous days of Jim Harbaugh's NFL playing career.
Then the quarterback of the Chicago Bears, Harbaugh had been playing a perfect game -- he went 16-of-25 for 171 yards and one touchdown through three quarters. The Bears were leading the Minnesota Vikings 20-0 early in the fourth quarter, when Harbaugh audibled from a play that coach Mike Ditka called.
Harbaugh subsequently threw an interception to cornerback Todd Scott that was returned for a 35-yard touchdown. When Harbaugh reached the sideline, an enraged Ditka berated him.