Dropped a Bridge on Him does not involve using bridges as weapons, although it may very well involve a bridge anyways.
Dropped A Bridget On Him is not about throwing Bridget onto somebody, but may involve the resulting discovery. Nor does it refer to writing a character out of a series by having him choose to stay or leave with a Girl of the Week, as this troper assumed when he saw the entry name.
Also, it does not refer to dropping a very small bridge on someone.
An Empty Cop Threat is an empty threat made by the police, not a threat to call the police that is empty because the threatener doesn't know how to call, would get in trouble himself, or would only get useless police.
Evil Power Vacuum is not about a energy-draining device used by villains. Nor is it about the latest Hoover being sold to overlords everywhere. It is also not a heroic weapon used to drain evil power from villains.
Felony Misdemeanor is not the name for a class of crimes under California state law. (California state law spells it "Felony/Misdemeanor", with a slash or a hyphen between the two words. It means a crime that can be treated as either a misdemeanor or a felony depending on the severity, such as drunk driving or theft.)
A Flash Mob is not a branch of the Mafia known for exposing their private parts in public or for being particularly good at using Adobe Flash.
It is not about any hypothetical cartel monopolizing the production or distribution of Flash RAM either.
Flash Step is not a reporting name. Nor is it when the floor lights up under someone's feet disco-style. And although The Flash could, in theory, put the move to good use, it's not something he does very often. It's also not when you advance through a web animation one frame at a time.
Flying Brick is not about a block of ceramic material hurtling toward a person's head. Or a block of ceramic material that is also a superhero. (Although it is related to superheroes.) Or the brick from the Brick Joke. And under no circumstances should you compare them to Vogon ships. It also does not refer to Wing Saber.
Forgot He Was a Robot is not about robots so sentient, they convince themselves to be human (or whatever they're modeled after) and have to be reminded they are, in fact, automatons. That would be Tomato in the Mirror.
Foot Popping is not when somebody's foot bursts, nor is it a literal case shooting oneself in the foot.
Four Is Death does not necessarily mean you will die at age four. Nor is it a version of the three strikes law in which a fourth "strike" nets the death penalty. (Although both of these could be true given the nature of the trope in question...)