Back before "Fast" Stefan Eriksson was crashing cars and lying to police, he ran a little portable gaming company called Gizmondo. Their scam? Defraud investors by promising them a way into the very attractive, and lucrative, gaming market.
One of their most effective tools was to promise a Gizmondo-exclusive portable Halo title. Gizmondo did have an arrangement with Microsoft Game Studios to produce some titles, including the popular MechAssault series, but Halo was definitely not a part of that arrangement. A former-Gizmondo employee told GameSetWatch that the title had only "a storyline and basic game structure at the very earliest stage of concept" and that it was all done "with a wink and a nudge to extract more cash out of the investors." Isn't that sweet?
It isn't all bad though: the engineers at Gizmondo managed to get code running -- using one of id's open-source game engines -- enabling the Gizmondo's rear-mounted camera to control the "mouselook", allowing for a uniquely precise handheld FPS control scheme. Who knows what could have come of the Gizmondo if the execs weren't busy lining their pockets?