Ever discover a code/easter egg on your own?
 

I remember once I was playing Toy Story for Genesis and somehow input the code for invincibility. Never saw it online until now (and I've checked multiple times in the past, so it must be new):

From GameWinners:
Invincibility:
Put all the toys away on stage 2, collect seven stars and jump into the toy box. Hold Down for approximately seven seconds.

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So yeah, ever discover a code or easter egg that you didn't know existed?

More lies

Figured out how to get Rat King and Karai by accident in TMNT Tournament for SNES.

Turok 2 Coop Glitch:

Play a 4plyr match with the level select code activated, with all four players in-game access the level select menu and choose any of the boss battles and all four of you will be able to face the boss. Will not work with single-player maps, the game will get all wonky.

Didn't find any indication of the glitch in any publication at the time.

I think I may have discovered a password or something at somepoint by myself but I can't exactly recall anything.

I did find a glitch in MK: Deadly Alliance when it first came out that I haven't seen mentioned anywhere else in the almost 10 years since.
When you're playing as Cyrax, you can freeze your opponents model. Throw out a grenade and, just as the opponent is hit by the explosion, hit them with your buzzsaw. The characters model will freeze completely and you just impale them with whatever weapon Cyrax had in that game (a lazer sword, I think) and they slowly die. Easy win.

Accidentally input the commit suicide code on Vice City by button mashing.

I figured how to get different music in WWF Attitude on the PSX. It inloved changing the language to teen or something. It was epic. Not sure who it changed. Might of given someone dX music.

Did a couple of Mortal Kombat 2 fatalities by accident. Baraka's blade decapitation was the only one I knew for a good while.