Fourth Wall

The Fourth Wall in video games refers to when a video game character suggests that he or she knows that he/she's fictional and acknowledge that this is just a game. They're found within many video games, usually for comedic relief. The following are notable examples of characters "breaking through the fourth wall".

SNES

 * Donkey Kong Country 3: Dixie Kong's Double Trouble - If you're able to find Krematoa, Blunder will ask if you've used the player guide to do so.
 * Final Fantasy V - A character in the game, when explaining something, will tell the player to listen up.
 * Super Mario World - In the stage titled "Funky", there are a row of coins near the end that spell out "YOU ARE A SUPER PLAYER!".

Nintendo 64

 * Paper Mario - The Koopa Bros. suggest that the sequel to Paper Mario should be Paper Bowser.
 * Super Mario 64 - Mario will on multiple occassions say "hello" to the player.
 * Yoshi's Story - Some times a row of coins will appear that says "YOU ARE YOSHIES BEST PARTNER!".

GameCube

 * Eternal Darkness: Sanity's Requiem - Many of the events that take place in this game break through the fourth wall once the main character goes crazy. Often times the game will mess with your TV.
 * Paper Mario: The Thousand-Year Door - This classic unarguably breaks the fourth wall more than almost any other game out there. They include the following -
 * Gus will, after being defeated, shout "CRUD! You dumb video game characters always do this!"
 * Goombella will say that Cheep Cheeps have been a part of the Mario series for a long time, and will then say "I just broke through the fourth wall there, didn't I? Sorry. Just forget it."
 * After tattling one of the gatekeepers, Goombella will explain that games would just be easier without them.
 * On one occassion, one of the character's reference how Mario is a silent protagonist.
 * Frankly will at one time ask if the people watching through the TV are listen, despite the fact that there is no TV is sight, obviously refering to the player.
 * Once you find out Four Eye's real identity (Lord Crump), he tellls the player not to tell Mario.
 * Super Mario Sunshine - After you beat the final boss, a Pianta will ask if the game's over.

Nintendo DS

 * Contact - The whole game pretty much breaks through the fourth wall, as they are well aware of your presence.