Count yourself lucky. Maybe he's a serial killer and his modus operandi simply didn't work on you.
Picture it. You answer the door. He's already standing feet away, straight as a board; dishevelled hair and emotionless eyes gazing over the package held ever so slightly as an offering near his midriff.
You consider the situation: Is this package for me? Why isn't he right on the doorstep, like a normal delivery guy? He isn't moving, so it must be mine, surely? Was that a movement; a brief outstretching of the arm? Yes, he's signalling. What a strange chap.
Guess you need to step forward.
You step from the house, but notice that the delivery guy seems maybe another couple of feet further back than you anticipated. Disgruntled now, you step forward again. Feeling as though you're trapped in a dream-state, you can't help but melt into those dead, sullen, unblinking eyes as he seems to effortlessly drift further away without ever visibly engaging his limbs to do so.
"Please, could you hand me the package?" you cry. Too late; the trap has been sprung, and like a hammer to glass the sound of a raging horn snaps your consciousness awake to witness the final moments of your life: Standing in the middle of the road, a rabbit to the headlights of an approaching truck -- and equally as little resistance to the devastating force of its grille.
DELIVERY: DEATH.