List of instances in which the fourth wall is broken

The term "breaking the fourth wall" mainly means that the characters of a series acknowledge that they are in a cartoon.

Now With A Sound Effect

 * Twilight breaks the fourth wall when she whines about Ultra Fast Pony not being fast.
 * Another instance is at the beginning where Twilight and Applejack are admiring the sound effect of Spike eating an apple, at the end where Twilight asks Spike if he can do it again and the title as a whole.
 * When Fluttershy hopes that all of her episodes revolve around her being shy.