From 1933, when the first NFL championship game was played, to 2008, when Super Bowl XLII was played, the team that has lost the most NFL championship games is the New York Giants who have lost 11 NFL championship games (pre Super Bowl) and 1 Super Bowl for a total of 12.
Oakalnd Raiders
The Pittsburgh Steelers have played in 15 AFC championship games. That is the most in NFL history.
New England
Indiana 1981
49ers i think 49ers i think
barcrelona
No. Every World Series team with a 3-0 lead has gone on to win the world championship.
The Houston Rockets defeated the Orlando Magic, 4 games to 0, to win the 1995 NBA championship.
the Yankees
every team
Yes, the 2006 Miami Heat lost two games in Dallas to the Mavericks, but won the next four in a row to win the championship.
the new york mets