Insanity is defined as doing the same thing over and over and expecting different results.No one feels that more than Cowboys fans.The 2023 season was supposed to be different. Dak Prescott posted a career year, CeeDee Lamb had the best receiving season in franchise history, and the defense was one of the most dominant in football. The Cowboys were a perfect 8-0 at home, the only team to go undefeated in their own building.But that was the regular season. And the more things change, the more they stay the same.The Cowboys reverted to their recent postseason form, allowing the Packers to rack up a huge lead in the first half and . It was the most points allowed by Dallas in postseason history, adding another lo sin a long line of devastating playoff defeats for the organization.MORE: Here is a look at some of the other worst playoff lo ses in Cowboys history.Cowboys worst playoff lo ses1981 NFC Championship vs. 49ersMost fans know it simply as "The Catch." The Cowboys know it as the start of the misery.During the 1981 NFC Championship, the Cowboys were a stop away from a Super Bowl berth. The 49ers were trailing late and needed a touchdown to keep their season alive. QB Joe Montana delivered with one of the famous plays of all time, finding Dwight Clark in the back of the end zone for the game-winning score.Joe Montana to Dwight Clark in the 1981 NFC Championship.The Catch. 40 years ago today. (Jan. 10, 1982) NFL Legacy (@NFLLegacy) It was e sentially the start of the 49ers dynasty in the 1980s, as Montana led the team to four Super Bowls.2006 NFC wild-card round vs. SeahawksIn Tony Romo's first playoff start, the Cowboys found themselves down by one point with po se sion late in regulation. The quarterback helped Dallas drive down the field, setting up the go-ahead field goal attempt with 1:18 remaining.All that separated the Cowboys from the divisional playoffs was a 19-yard field goal by Martin Gramatica. However, Romo, who also was the holder, fumbled the snap, leading Rick Barry Jersey to no points getting put on the board.16 years ago tonight... holder Tony Romo bungles the snap on a potential go-ahead 19-yard field goal attempt with 1:19 remaining in the 2006 NFC Wild Card Game.The prevail in Seattle, 21-20. Kevin Gallagher (@KevG163) With the miscue, Seattle hung on for the win, eliminating a stunned Dallas crew.2008 NFC divisional playoffs vs. GiantsIn 2008, the Cowboys had a 13-3 record and were the No. 1 seed in the NFC playoffs. After sweeping the Giants in the regular season, Dallas had a date with its divisional foe in the first round of the postseason.MORE: Eli Manning & Co. came into Texas and stunned the Cowboys, upsetting Dallas 21-17 to knock out the top team in the conference. The Giants ultimately went on to ruin the Patriots' perfect season with a win in Super Bowl 42.2014 NFC divisional playoffs vs. PackersTwo words no catch.During the 2014 divisional playoffs, the Cowboys appeared to score a go-ahead touchdown when Dez Bryant hauled in a touchdown pa s in the fourth quarter. However, after a lengthy review of the play, the officials determined that Bryant did not have po se sion of the ball, and it was ruled incomplete.On this day 8 years ago, Dez caught it. Field Yates (@FieldYates) Instead of taking the lead with under five minutes to go, it was a turnover on downs and the Packers were able to hold on for a 21-16 win.2016 NFC divisional playoffs vs. PackersStop me if this sounds familiar: The Cowboys had the No. 1 seed in the NFC again, coming off a 13-3 regular season. It set up a divisional playoff matchup against the Packers, the second time in three years the two storied franchises met in the postseason.While Prescott threw for 302 yards and three TDs, it was not enough to topple Aaron Rodgers. The Packers quarterback led a late field-goal drive, giving Green Bay a 34-31 victory.2021 NFC wild-card round vs. 49ersIn 2021, Mike McCarthy had led the Cowboys to a 12-5 record in his first season in Dallas, setting up a wild-card matchup against the 49ers. Dallas had a chance to drive for the game-winning touchdown down by six points, but the game ended in one of the most bizarre fashions.Not an ending you see everyday Yahoo Sports (@YahooSports) With no timeouts and 14 seconds left on the clock, Prescott elected to take off on a quarterback sneak, gaining over 15 yards on the play. However, it took too much time off the clock, as Prescott and the offense failed to get to the line of scrimmage to spike the ball. The unceremonious ending resulted in a 23-17 victory for San Francisco. Elvin Hayes Jersey