A character is walking along when he notices a window that is apparently open. He wonders aloud who left the window open as he walks over to close it, only to run directly into the glass, revealing that the window is so clean that it gave the impression that it was open. Or a character looks over at the kitchen area to see an open area so they run over to it, only to run into the glass again, revealing it to be a sliding glass door that also gave it the impression of being an open door.

This is a {{Comedy}} trope where a character will mistake a clean window or a sliding glass door for an open door then run into the window or door when they try to go through it.

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!'''Examples'''

[[foldercontrol]]

[[folder: Advertising ]]

* A series of Windex window cleaner commercials featured a pair of birds who were musing about how said cleaner is so bright that birds could get hurt flying into the windows that were cleaned.
* Inverted in [[http://www.youtube.com/watch?v=HvyAlEfnoYg this]] Super Bowl Doritos commercial.

[[/folder]]

[[folder: Anime and Manga ]]

* In ''LightNovel/HatarakuMaousama'', while Emi is at a convenience store with her back to the entrance, an assassin lunges at her... only to smack into the sliding glass door.

[[/folder]]

[[folder: Film ]]

* ''Film/OverTheHedge'': Verne and the other animals try to escape from Gladys' house after trying to get food from her house, only to run into a sliding glass door.
* Happens in the chase sequence at the beginning of ''Film/CatsAndDogs''. Buddy sees the cat he's been chasing sitting just outside an open door, dives at it...WHAM.
* Played straight in ''Film/BattlefieldEarth'', when Johnny enters a long-abandoned mall and runs into a plastic display case, apparently not being able to see through the [[WhatAnIdiot frosted, moisture-covered glass]].
* In ''WesternAnimation/{{Antz}}'', Z walks toward a sandwich in a picnic but ends up walking into the plastic wrapping, which he thinks it's SomeKindOfForceField.
* A frightened Nemo keeps running into the aquarium walls in ''WesternAnimation/FindingNemo''.
* In the 1967 ''Film/CasinoRoyale1967'', archvillain Dr. Noah (Creator/WoodyAllen), in his underground lair, meets up with his uncle James Bond (Creator/DavidNiven), and lowers a big sheet of invisible glass between them. When James sums up his plans for world domination as compensation for his feelings of sexual inferiority, Noah angrily steps forward - forgetting about the glass and smashing it to bits.
* In ''Film/TheManWithTheGoldenGun'', James Bond is trying to navigate Scaramanga's lair and walks into a clear glass wall.

[[/folder]]

[[folder: Theatre ]]

* In the play ''What I Meant Was'' by Craig Lucas, a mother forgives her son for (among other things) pretending he didn't know her when she walked into a plate glass window at his grade school and broke her nose.

[[/folder]]

[[folder: Newspaper Comics ]]

* This was used four times in ''ComicStrip/{{Garfield}}'':
** [[http://www.garfield.com/comics/vault.html?yr=1979&addr=791022 Garfield tried to sneak up on Odie, only to run into a patio door.]]
** [[http://www.garfield.com/comics/vault.html?yr=1982&addr=821207 A bird runs into the window while Garfield was explaining about windows.]]
** [[http://www.garfield.com/comics/vault.html?yr=1993&addr=930912 Jon mistook a window that Garfield cleaned for being left open.]]
** [[http://www.garfield.com/comics/vault.html?yr=2000&addr=000711 Jon ran into the sliding glass door after noticing a dead bird on the lawn from flying into said door.]]
* Happened to the Crocodiles in [[http://www.gocomics.com/pearlsbeforeswine/2012/04/01 this]] recent PearlsBeforeSwine strip.

[[/folder]]

[[folder: Live-Action TV ]]

* On ''Series/ModernFamily'', Claire is worried that a dog Phil's father brought will walk into the back door. The dog doesn't, but their son Luke does.
** In another episode, Cameron walks into the back door screen on Jay's home.
* ''Series/ICarly'': Spencer invokes this in the episode "iPrank." He pranks Sam and Freddie by having a clear, nearly invisible plexiglass wall placed in front of the elevator so whoever exited it would smack into it.
* The first clip in the Daisy Fuentes-John Fugelsang era of ''AmericasFunniestHomeVideos'' to win the $100,000 top prize was security camera footage of this trope.
* In ''The Cosby Mysteries'', a FemmeFatale tries to shoot Creator/BillCosby, only to discover he's standing behind a sheet of bulletproof glass he's set up in the room between them.
* In the ''Series/{{Haven}}'' episode "Silent Night", the town of Haven gets trapped under a giant glass dome. Several birds and drivers crash into it.

[[/folder]]

[[folder: Web Comics ]]

* [[InvertedTrope Inverted]] in [[http://www.egscomics.com/?date=2002-08-08 this strip]] of ''Webcomic/ElGoonishShive''. Ellen ''expected'' a window of a secure government facility to have glass and braced for impact when she was thrown toward it; it did not and she merely had to contend with a two story drop.

[[/folder]]

[[folder: Western Animation ]]

* Happens to ''WesternAnimation/MrBogus'' in the second act of the episode "[[Recap/MrBogusS3E3WaterboyBogus Waterboy Bogus]]".

[[/folder]]

[[folder: Real Life ]]

* Birds are prone to flying into windows because they don't know that they're actually glass, so they end up hurting themselves real bad.
** There are a few instances of birds having left clear impressions of their bodies on windows after flying into them (apparently due to residue from their feathers).
* One fatal real life example proved crucial to proving the existence of [[MorallyAmbiguousDucktorate necrophilia among ducks]].
* Several types of insects who follow the light-source (for an example, flies and bees) are known to repeatedly run into glass and they can even starve to death trying to fly through it even if there is an obvious way out of the house.
* Music/JustinBieber has walked into a glass wall in 2010 and 2013, suffering a concussion from the second incident.