GameCube

The GameCube is Nintendo's first disc-based console, with a total of 640 games released (the last being Madden NFL '08 on August 14, 2007). Sadly, the odd disc format and "kiddy" perception of the console hurt its ability to build a healthy third-party library, but it still contains an array of fantastic first-party titles and the occasional third-party exclusive.

Funnily enough, while the GameCube itself may have died young, its incredibly forward-thinking architecture lives on: the Wii is essentially a GameCube with faster clock speeds from an internal standpoint.

Main Menu
Wo3c-MQRAmc The main menu ambiance may sound relatively toneless, but speed it up by 19x...and there's the Famicom Disk System's startup fanfare.

Nintendo 64 Support?
The SDK has strings that reference all of the known N64 peripherals, including obscure ones such as the keyboard and mouse. Chunks of text containing these strings can be found as leftover in various games, including Wario World, while GameCube Service Disc v1.0/03 can detect N64 controllers.

An N64 cartridge showed up in April 2013, which turned out to be a Dolphin controller test. This can run on stock Nintendo 64 hardware, and seems to test the connection between controller 4 (as that modifies the settings) and the Dolphin. This shows that at one point in development, that the Dolphin once was based on N64 hardware.

Familiar Reflection
If the soft reflections on the GameCube startup animation and menu look strangely familiar to you in a very Nintendo way, that's because the texture file is the same one used in The Legend of Zelda: Ocarina of Time and Majora's Mask for shiny items.