Ah yes, Sly 2 demo on Ratchet and Clank 3.

There was a game gear game that had a cheat code which required you pressing 2 buttons simultaneously. 4th grade me didn’t know what it meant so I just pressed both buttons is such rapid succession until I inadvertently pressed them at the same time and unlocked the cheat

“Use the middle stick to dodge the Joker’s bullet”

i was 28 when i still didnt know it