I never believed the curse stuff until I watched the 1997 World Series.
In addition to that 1997 World Series collapse in Game 7, the following have happened in Cleveland sports:
"Red Right 88" happened in 1981
"The Drive" happened in 1986
"The Fumble" happened in 1987
"The Shot" happened in 1989
Just google any of the above phrases that are in parenthesis
There's more. The blown 3-1 ALCS lead to the Red Sox, the World Series loss to the Braves, the 89 AFC Championship loss, the NBA Finals loss to the Spurs, etc. , but they don't have actual phrases attached to them that can be googled.
Not to mention the Browns leaving town and moving to Baltimore, and LeBron announcing his "Decision" on live TV to go to Miami.