The medium through which the script shows its face: the speech box, or text box, or speech bubble (and likely many other names, besides). Herein you'll find a dumping ground of prime examples of speech boxes in video games.

In No More Heroes

A case in which breaking the mold turned out to be a very cool thing to do, indeed. The ugly, boxy, dumped-at-the-bottom-of-the-screen standard is tossed in favour of something completely different: hazard tape-like bands haphazardly thrown across the screen speak to the trendy, grungy style of the game, and despite the disbanding from tradition are completely recognisable as speech boxes. Even the not-quite horizontal placement of the bands fail to irk and are actually pleasing to the aesthetic sensibilities.

References:

Screen shot from No More Heroes by IGN.