Joe
The security guard in every stealth game whom by murdering triggers every security guard to converge to your location.
Guard A: "Hey man, it's Joe's birthday!"
Guard B: "Really?"
Guard A: "Let's surprise him! All units converge to Joe's position."

All Units: "Hey Joe!"
*They discover you holding Joe's dead body with a knife stuck to the back of his neck*
All Units: ">:("

Mission Failed. No Optic Camo for you.