The tendency of some "geniuses" to tell people of their master plan to destroy them before actually doing it. This usually results in the plan being foiled and said "evil mastermind" getting their comeuppance.
Multiple James Bond Films.
"Oh great, ol' Goldfinger's got diarrhea of the mouth again and is giving his 'Bad Guy Monologue' before he saws the guy in half with a laser..."
"One of these days that's going to bite him in the ass."
The trope in every action movie by which the villains, often highly trained soldiers, mercenaries, and hitmen launch an arsenal of every weapon known to man, yet can barely nick our hero or heroine with anything more serious than a flesh wound.
Often paired with the Good-Guy Bullseye, which Our Hero/Heroine uses to bring down a spaceship or aircraft carrier with a single, blindfolded shot from a pea-shooter.
Black Widow saved the day because the Russian hit squad had Bad-Guy Aim, allowing her to destroy the Kremlin by throwing a paper plane at it.