Well, sure. Some writing schools recommend action lines in preference to parentheticals. Me, I don't see the difference, I wouldn't bounce your script for
CHRIS
(shouting)
Bobby!
...any more than I would bounce it for
CHRIS
BOBBY!
...without the preceding action line, since BOBBY! is obviously shouted (capped plus exclamation mark).
-Derek
-> * <- Click on this magic star to be transported to my website. Ruby slippers optional.
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"Your Honor, may I have permission to treat Ms. Vito as a hostile witness?"
"You think I'm hostile now, wait 'til you see me tonight."