Shouting Shooter

"**BzZZZzzZZZzz RARARARA BWRRRRRRRRR! WOAHAHAHAHA!**"

There's something about the roar of a machine gun that makes the wielder want to roar along with it.

The character could be letting off some anger, or despair, or just get caught up in the adrenaline of the moment.

Can overlap with Firing in the Air a Lot.

Compare Screaming Warrior.

Examples of Shouting Shooter include:

Anime and Manga

Teana Lanster of Magical Girl Lyrical Nanoha StrikerS did this during the time when she was recklessly shooting down the Mecha-Mooks attacking Hotel Augusta and almost shot her own teammate.
During the Cell Saga, the army attacks Cell before the tournament stops all at once. One of the focus shots was off one of the soldiers on the ground. Guess what he was doing during the open fire free-for-all.

Film

The end of Rambo II.
Reb Brown is king of this trope, particularly in Strike Commando (a low-budget Rambo II ripoff) and Robowar (a low-budget Predator ripoff).
Picard did this when gunning down the Borg in Star Trek First Contact.
O'Connell did this when trying to shoot at the wall of sand in The Mummy Trilogy.
Jack Black does it in the poster for Tropic Thunder.
UHF, during in the Rambo II parody.
Point Break has the infamous scene where a character shoots rapidly into the air while screaming. It was later parodied by Hot Fuzz.
Mifune, from Matrix Revolutions.
Reb Brown is essentially the patron saint of the trope. Is he in the movie? High chance of RAAAGH. Does he ever hold a gun? It's all but guaranteed.
- And in Space Mutiny, it's combined with Screams Like a Little Girl for maximum Narmitude.
Pulp Fiction contrasts an amateur Shouting Shooter, vainly emptying his entire magazine at the hitman protagonists, with their wordlessly efficient response.

DIE, YOU MOTHERFUCKERRRRS!!!

Live Action Television

Gwen Cooper does this in the Doctor Who series 4 as she and Ianto empty G36C's into a Dalek which is slightly anti climatic as they are protected by a time lock.

Video Games

As does Big Boss in Metal Gear Solid 3: Snake Eater, and Solid Snake in Metal Gear Solid 4: Guns of the Patriots, although both restrict this to when using the game's light machine guns.
Pictured above, The Heavy from Team Fortress 2 loves to do this. When he's not telling you to CRY SOME MORE!, that is.
Firing the M60 in the Half-Life Game Mod Half-Life 2: Jaykin Bacon Source makes the player start yelling.
Sgt. Whittaker does this towards the end of Final Fantasy the Spirits Within, as he repeatedly fires a truck-mounted cannon at a giant Phantom. Justified, because he tried to lure it away from the other heroes. This quickly becomes a Heroic Sacrifice, though considering he was already dying from earlier wounds, anyway, he didn't have much to lose.
In Final Fantasy XIII:
- Snow does it in Palumpolum when he shoots an overhang in an attempt to scare the crowd away from being shot themselves.
- On board the Palamecia, Vanille does this while gunning down a Vespid Soldier when it and a couple of PSICOM troops come to move them to another cell.
Sgt. Reznov does this while mowing down German soldiers in Call of Duty: World At War.
Zaeed Masani of Mass Effect 2 does this when angrily shooting at Vido Santiago's escaping dropship in the Paragon ending of his loyalty mission. It apparently imbued his bullets with anti-materiel penetration power, as it headshotted the dude sitting right next to Santiago, who visibly freaked out at it.
World of Warcraft recently added in a quest where you help a group of people known as Bravo Company, led by John J. Keeshan, go through an entire orc battalion using a siege tank with Keeshan manning a turret. Keeshan screams appropriately, and the quest is even aptly named AHHHHHHHHHHHH! AHHHHHHHHH!!!
The player fires his gun into the air at the end of each level in Total Carnage. YEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAHHHHH!!!
Rocket Raccoon in Marvel vs. Capcom 3 will do this often, most notably during his Gatling Good Level 1 Hyper Combo.
The mercenaries in Far Cry: Instincts like to do this whenever they get their mitts on a heavy machine gun, gravitating between macho tough-talk and panic-stricken gibbering.

Web Original

In The Spoony Experiment review of Ultima I game, a Cutaway Gag showed Gandalf taking on the Balrog with firearms, including screaming as he fires an assault rifle.

Western Animation

Heffer from Rocko's Modern Life did this once in an episode paying a certain Homage to Ghostbusters (among other things).
Quagmire has the Giggity Gun on Family Guy.

Real Life

Standard procedure in the early days of the Bosnian army when firing a large caliber machine gun from indoors- makes your ear-drums slightly less likely to burst and no one can hear you over the gun anyway. Ear-protection is much more practical and not to mention less dramatic, tough.