Don't expect this one to still work — I get the feeling that Activision busted ass getting this thing patched up the moment it was discovered — but just so everyone can scratch their heads over the most baffling bug in recent memory, I present to you a story.
It seems that a bizarre bit of code within Activision's hyper-popular Modern Warfare 2 allowed owners of that game to access and play five different Xbox Live Arcade games, published by SNK, free of charge. Included in this list were classics like King of Fighters '98 and Garou: Mark of the Wolves.
What does SNK have to do with Modern Warfare 2? What does Activision have to do with classic 2D fighters? Who the hell knows!? There isn't even rampant speculation here, just baffled stares and slackened jaws from everyone involved.
Hit the jump for a quote from Worth Playing that registers as the closest anyone can offer to an actual explanation so far.