Commentators curse
When a commentator of a sport or other competitive event praises a team or player and then that team/player soon after has something bad happen to them (concede points, injury etc.)
Commentator: Team A is looking really good this half, Team B just can't break their defense.
*Team B immediately breaks the line of defense and scores*
Team A fan: God damn it, why did he have to apply the commentators curse?
*Team B immediately breaks the line of defense and scores*
Team A fan: God damn it, why did he have to apply the commentators curse?