Cleveland Browns – 1990
The Browns were a strong outfit throughout the 1980s but they didn’t start the new decade well at all. Bernie Kosar was a reliable presence at quarterback until 1990. Then he became an interception machine as his form suffered a stark decline. There’s no accounting for how quickly a signal-caller can deteriorate but it was a nail in the Browns’ coffin.
Meanwhile, they had a porous defense that saw them concede 58 points in a single game. In the end, they finished the season with a harrowing 3-13 record after high expectations. The perennial AFC contenders couldn’t make it to the postseason and eventually left the city for a few years (via Andscape).