If life were an FPS...
People would routinely strafe around objects in their way rather than simply walking around them.
Every time you saw your cars reflection in the bumper on the car ahead of you, you would be reminded of just how awesome your video card is.
Rather than getting a step-ladder, you would just crouch-jump onto tall objects.
Soldiers would be able to carry up to ten guns without being slowed down, and each one would have a special alt-fire attack.
They would also circle-strafe during fights.
And bunny-hop.
Old people would rocket jump to reach things up high on shelves in stores.
Music coming from nowhere would play whenever you accomplish something.
Ten-year-olds would be commonly found in anti-terror units, and have more confirmed kills than a veteran.
World War II would have been won by the Allies transmitting the Axis documents on mptest.
Aimhacking would be a capital offense.
Codec distortion and static would occur whenever someone spoke.
When people die, they would violently vibrate back and forth for about sixty seconds before a death animation plays, and the body promptly disolves into the ground.
Parents who's children go go on shooting sprees would have nothing to blame it on.