You never run out of bullets, only grenades. Ninjas are common, and fight in public frequently. Whenever huge evil fat men are about to die, they begin flashing red or yellow. When you are born, you're invulnerable for a brief period of time. Although the enemy always has more aircraft than you, they fly in predictable patterns which makes it easier for you to shoot them all down.
All women wear revealing clothing and have great bodies.
The enemy always leaves weapons and ammo laying around for no other reason than so their bitter enemies can pick them up and defeat them with it. You sustain injury if you shoot innocents. Gang members frequently all look the same, and often have the same names. When driving, do not worry if your vehicle crashes and explodes. A new one will appear in its place.