Formerly Feeling The Hit.
Sub-Trope of Punch! Punch! Punch! Uh Oh..., which occurs when someone tries to hit the enemy, but the enemy's Made of Iron so they don't feel the hit. In this version, the hitter ends up hurting themselves, rather than the target.
In some examples, the blow rebounds back through the weapon used, which is normally a staff/rod, making it vibrate. In these cases, the vibration spreads back into the hitter and renders them incapable of action. Often Played for Laughs
Compare No Sell, which is this trope for special powers rather than weapons.
Contrast with Invulnerable Knuckles, where a fighter never suffers any realistic damage to his fists. Subversions of Invulnerable Knuckles don't generally highlight the power of the punch's target (eg: someone punching a wall and hurting their fist, which would be an example of the trope, doesn't mean the wall is all-powerful, it's just a wall.)
This trope is meant specifically to show how powerful the target is.
See Also Broke Your Arm Punching Out Cthulhu.
In Teenage Mutant Ninja Turtles II, Donatello hits Tokka with his staff. Tokka doesn't feel anything, but the staff twangs, and this goes back into Donatello, who wobbles.
Superman (1978). A group of robbers is escaping by boat. Superman shows up and stands on deck facing them. A robber comes out of a hatch behind him and hits him over the head with a metal bar. Superman isn't hurt, but the impact causes the bar to vibrate and stuns the crook.
At the end of Get Smart, Larabee punches Hymie the robot in the gut. There's a metallic clang, and Larabee flinches away cradling his hand.
Moonraker: When James Bond fights Jaws in an elevator, he hurts his fist when he punches Jaws' metallic teeth.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.