What audio Easter eggs exist in classic games?

[killamch89]

What hidden sound cues, melodic nods, or developer inside jokes have you uncovered in classic titles? Perhaps the reversed guitar riff at the end of Castlevania’s Bloody Tears, the hidden Moog filter blip in Sonic’s Emerald Hill Zone, or the Kazoo flute callback in EarthBound? Have you heard chip‑tune motifs referencing unused prototype levels or developer signatures concealed in sound drivers? How did you discover these Easter eggs - data mining, pitch‑shifting, or community lore?

[Scorpion]

Classic games often hidden audio Easter eggs like secret sound effects, hidden messages, or references to developers. Examples include the hidden messages in the Legend of Zelda or secret tunes in Mario, adding an extra layer of fun for players who discover these hidden audio surprises.

[killamch89]

Perfect Dark on N64 included an entire cheese-themed audio language toggle in its options menu. Every character would speak incomprehensible 'cheese' language with fully recorded alternate dialogue. This absurd audio replacement showed how even serious games included completely ridiculous sound options for developers' amusement.