E) swiss cheese door, walls around door, floor in front of door and ceiling above door. shoot until out of ammo. start throwing guns, knifes, alarm clock, pillows...
j/k, the only way i would ever shoot sight unseen through door is if someone else has already started shooting at me through said door and even then, i'll probably opt for a window exit.
i've heard eerie/hair raising rattlings at door before and it just turned out to be the wind trying to pass threw the house w/ a closed door in the way. (and believe me, it didn't sound like wind could do that)
"Stan, what did I tell you about watching the Osbournes? It's going to make you retarded!" Stan's Mom (south park)