The scream sounds cool if its not constant. Maybe you should scream a bit when you pick "it" up and when attacking, but thats it.
Sneaking up on someone and only screaming as you attack would be sweet.
YEAARRRRRRGHH!!!
"What was that?!?..." Looks left... looks right... Steps around the corner...
ARGHGHGHGPUNCH!RGHRGHRGKICK!RGHRGHRGHBITE!ARGHGHGH...