The hero is losing to some villain, when the villain notices some large screw under their feet. Rather than leave it be, and shoot the hero, they kick it. The bolt hits a pole which shakes a bird causing it to fly off, the poops on someone's windshield causing them to drive their car into a water tower, the tower falls over, flooding the streets. Someone notices, and sounds an alarm, within feet of the villain providing just enough distraction to catch the villain off-guard for long enough for the hero to disarm them.
This trait is stock and trade of the Born Lucky
, and sometimes the Chosen One
. Expect some overlap with For Want of a Nail
and Butterfly of Doom