Joe Calabrese said:
There are no rules except don't overuse.
CAPS are like seasoning on a dish. Every once and while and for the right reasons is okay. I wouldn't CAP every action or item that needs attention, but I would use it sparingly to add emphasis, to focus the reader.
A BANG, or he FIRES, or she picks up the KNIFE once and a while can focus the readers attention to what you want them to focus and more importantly, remember.
Underlining is not a good idea for reasons mentioned previously. I think it distracts too much.
The important thing to remember (as is with everything in a script), do not overuse and only when really important-- whether it be CAPS, transitions, VO, OS, or parentheticals.
I'll throw in a bit here about the origins of using uppercase within a script's narrative, and that is ... it comes from the big studio days of the 30's, 40's, and 50's when MGM or Columbia or Paramount might have a dozen pictures in various stages of production at the same time, an industrial scale operation involving thousands of workers. To make things run a bit more efficiently in this madhouse, writers were required to use uppercase on SOUNDS and on PROPS and perhaps on significant WARDROBE considerations so that ... a sound recordist for example could scan a script and find sound cues much easier than if he had to read the entire narrative looking for them; written in uppercase, they stood out and were easy to spot on the page.
This was an important consideration when said same sound recordist was working on two or three pictures at a time, doing a scene for one on Sound Stage "C", then running to stage "B," then runnning to the back lot for an exterior. Or, better, when handed a new script for a project just going into production that he needed to review so as to determine the extent of unique recording needs he had to prepare for.
Okay, that's where it all started.
Hence the reality is that today in a spec there would be no need at all to use uppercase beyond on a character's NAME when they are introduced.
But of course the habit of using uppercase on SOUNDS and PROPS didn't just disappear from the lexicon when the mass production of movies changed to more of a one-off style. The same writers who wrote shooting scripts were the same one's who wrote the first specs, when the concept of a "spec" came into beiing in the late 50's and early 60's. They did what they had always done, uppercase on SOUNDS and PROPS.
Newer spec writers who came into the scene at that time quite naturally picked up on this and did it themselves, even though it was no longer necessary from a studio production standpoint.
Somewhere in there some writer who didn't have a clue about the background and origins of using uppercase, decided the technique represented a good way to bring attention to something, to emphasize something, or to add a bit of pizzazz to something, so that
The bomb explodes, KA-BLOOIEE!
was a more exciting and colorful treatment than
The bomb explodes.
or even
The bomb EXPLODES.
Fast forward to today and we find discussions such as we're having in this thread, with writers agonizing over when and if to use uppercase in their narratives.
Today, it really has become a matter of voice and style; some writers do it, others don't. I used to do it, now days I'm much less inclined and will only do it to add pizzazz and color and energy to the read when things otherwise will read much less colorfully and convey much less energy and verve.
To my eye a script that's loaded with uppercase presents a less comfortable read that one which reflects a more judicious use.
Harry grabs the GUN and runs along the CATWALK, leaps to the STAGE, and confronts an ANGRY NIGHT WATCHMAN, whereupon he SLUGS him with a CRISP left hook and keeps RUNNING, FIRING his PISTOL as he goes, BANG! BANG!
This voice drives me crazy, as it would any producer reading it.
It assumes that meaning can't be conveyed with normal case, which is of course a fallacy.
Judicious use is the key, moderation, reserving use so that when it is used it has a more pronounced effect simply becuse it's uncommon.
One way to approach the use of uppercase in your narrative is to write using none, and then when rewriting have a look to see where the use of uppercase might enhance the read by providing added color, emphasis, energy, pizzazz, or zeal.
A word about underlining ... We rarely see this in narrative and I for one don't think it belongs. However, there is a place for it in dialogue. In order to establish some kind of consistent method for indicating the level of volumn you want in a speech, the general industry practice is this:
But he said Joe was gonna do it!
But he said
Joe as gonna do it!
But he said JOE was gonna do it!
with each rendition indicating a progressively louder sound on the word "Joe." First, normal case = normal voice; second, underlined word = a somewhat louder and more emphatic delivery; third, uppercase = a shout.
We can of course use a wrly to indicate a sound level for an entire speech,
CAPTAIN STINSON
(a shout)
You men! Get over here!
But again, these uses should be moderate in application; one simply cannot characterize every speech with respect to tone or volumn. Explicit indications should be used when it wouldn't otherwise be clear and the volumn or the tone has some significance.
Find your voice.
Cheers!