Anyone who has dealt with 5 year old kids, especially but not exclusively girls, knows they often scream in normal play. I'm not sure whether it shows excitement, or whether it is just a way of fitting in. It's hard to believe the human vocal system can go as high in pitch as the girls go.
I'm tempted to say that this distinguishes kids from adults, that adults only scream in desperate fear or calls for help.
Except that isn't true at sporting events, or political rallies: many adults never grow out of the yelling/screaming phase. They apparently do it for much the same reasons: excitement, anger, fitting in. I would claim a lot of the enjoyment people get from watching spectator sports is releasing tension through a form of "primal scream therapy."
A survey was conducted relating to a proposed hockey arena, with results shown at
http://www.bristolcityst.org.uk/pdf/New%20stadium%20survey%20results.pdf 24% of survey respondents agreed with, and 73.1% of respondents strongly agreed with
"The ground’s acoustics should be designed so that the fans’ cheers reverberate around the stadium, creating a cauldron of noise."
Silly me. I thought arenas should be designed to damp out excess noise and reverberation, to make it easier to understand spoken announcements. Also to make it easier to sync what you see with music played, in dance moves, cheerleading, and figure skating. I was completely wrong.
I know someone who screams at his television set (and Youtube computer screen) during political things, when no one else is watching. He knows knows the television doesn't hear him, but he screams anyway.
I conclude that making noise is normal human behavior.