I know it's hard to believe now in an age where Street Fighter fans have been able to play as M. Bison and Balrog for decades, but there was once a time when the four Shadaloo bosses were restricted to CPU control only.  They were fruits you must not taste in the original release of Street Fighter II: The World Warrior in the arcades and that limitation carried over to the Super NES home version.  Still, that didn't stop eager players from being absolutely sure that there had to be some hidden code that would unlock Vega, Sagat, and the rest as playable characters.  Electronic Gaming Monthly used its reader mail column back in 1993 to try and convince players that there was no secret boss code no matter how many kids in the schoolyard said otherwise.  They did find Game Genie codes that could brute force access to the bosses, but that's not quite the same thing, and the "Champion Edition" mirror match Down R Up L Y B code certainly didn't get the job done either.

I remember playing Street Fighter II for the Super NES the summer it came out with a neighborhood friend and we spent too many afternoons just trying to get to the bosses at all, let alone trying to control them.  The challenge with the bosses was that unlike the regular World Warriors, we couldn't practice their moves to understand their strategies in a controlled two-player environment.  When Vega leaped up onto his fence and flipped down on us, we had no idea what was coming or what to do about it.  Sagat's endless "TIGER!  TIGER!  TIGER UPPERCUT!"?  Forget about it.  We were strangers in a strange land and no amount of jamming on the punch buttons to electrify Blanka could save us.

(via Reddit)