In Real Life doors are big, sturdy, unwieldy, heavy, and often securely fastened to their hinges. They are used to block or allow entry to different parts of a structure, and their use as weapons is generally not even considered beyond slamming them in someone's face in a fit of anger.
In fiction-land, however, those same traits above lend doors to be perfect Improvised Weapons for The Big Guy or other characters with Super Strength: They're big, so they are not so easily dodged; they're sturdy, so they aren't going to break after short use and make for excellent improvised tower shields (Some doors are outright Made of Indestructium); They come with handles to alleviate the whole 'unwieldy' aspect (and unlike Real Life, these handles almost never break); they are heavy, so you can make sure any blow you strike inflicts just as much blunt damage as a bona-fide Shield Bash; and so omnipresent that if you are in any location with a building, you can be assured there's a door within reach should you need a weapon.
Compare The Door Slams You, which is comedic and unintentional for the characters; Door Judo, which is when a character tries to break down a door by charging at it only for the door to open and leaving said character Too Fast to Stop; and Tae Kwon Door for when a door isn't wielded, but still recognized for its ability to inflict damage.
- Lanfeust: Hebus the troll tries to break open a steel porticullis, and when that fails, to bend it. Cut to a guard leaning against the gears smugly mentioning he'll never get through, then back to Hebus simply grabbing and then lifting the grate, pulling the unfortunate guard's body into the gears as the mechanism is reversed.
- In Kill Bill, the Bride/Beatrix Kiddo smashes a heavy steel hospital door into Buck's head while demanding to know where Bill is, before finally killing him with it when she realizes that Buck was the guy who raped her while she was in her four-year coma.
- In The Lost World: Jurassic Park, Ian Malcolm uses a door as a shield against a velociraptor.
- This happens one time in the Codex Alera series when some characters are trying to hold a room against some taken Canim (giant zombie wolfmen), they are about to break through the door, so one character decides to break the door down in such a way that it falls outwards and crushes one of the Canim.
- In Call of Duty: Advanced Warfare, the player can rip off car doors to shield against a drone swarm in the opening mission.
- In Dark Souls III, the Giant Door Shield is a pair of doors used as shields. The wielder dual wields a pair of doors to block incoming attacks, slam their enemies, crush them by shutting both doors, or charging toward them while negating most attacks.
- This was a more-refined variation of a pair of individual greatshields from Dark Souls II called Orma's Greatshield and Reeve's Greatshield, which could be dual wielded in Power Stance to generate a similar "slam" attack.
- In God of War II, Kratos kills Theseus this way... after first impaling him on his own spear.
- Braum from League of Legends wields a massive shield that was once a door. There's a story behind it: A devious troll tricked Ornn, the demi-god of the forge, into creating an indestructible door to protect his treasure hoard. Ornn did exactly as commanded
but neglected to include any method of opening said door, leaving the troll as trapped outside as any thief. Later on, the indestructible door got between Braum and saving a troll child. Now, usually any object in that position ceases to be so in short order, but this one even Braum couldn't touch... so he smashed through the mountain around it, and picked it up to use himself, under the logic that if it can stand up to him, it can stand up to anything his enemies might throw at him. Usually he uses it for defense, but...
Braum: Sometimes, shield becomes smashing board.
- In Mappy, if you close an open door while a cat is walking through it, you can stun it.
- Discussed Trope in Fire Emblem: Path of Radiance in Shinnon and Gatrie's A support, which overlaps with Noodle Incident since we never got to saw it in action.
Gatrie: What about the other day, when I bought the Ultimate Shield?!Shinnon: Gatrie, that was a castle gate.