The 'Halo wait that's illegal' meme originates from the iconic video game series Halo, developed by Bungie and now managed by 343 Industries. This particular meme features a Spartan soldier, a key character type within the game, who encounters a moment of confusion or disbelief while standing before a holographic display of weaponry. The caption "Wait. That's illegal." reflects the soldier's reaction to something that breaks the rules or the norm, often humorously applied to situations in real life where something seems off or not quite right but happens anyway.