Sniper Rifle Ideas

Ok guys... so our dumb ass assassin has his ONE big bullet and he's loaded and ready to pop him in the DOME.
Idea 1:
Window or blinds fall apart and (as josh has drawn it atm) a plank of wood slides down and knocks the gun and throws him miles out off the target.

Idea 2:
Our sniper repositions and accidently sits on a tv remote that puts on some HEAVY metal tv or something REALLY loud! which makes him go HOLY Cr*p.

Idea 3:
Same as above but his elbow knocks a switch for a vibrating bed and starts going up and down and UhuhuhuHhHuHhHuHuH. Etc.

Idea 4 (the iffy one)
There's some sexy time going on next door and you hear it all and the thumps get louder and louder... he pulls the pistol and points it at the wall guessing where they are but doesn't fire... The whole wall is shaking and the sniper rifle is lined up still and the book case is starting to come away from the wall. Books jumping out as the thumps get harder. Couple of books fall and hit the rifle making it go off and the bullet wasted.

Idea 5 (scraping the bottom of the toilet now)
A newspaper in the street floats across the scopes sight as he's taking the shot making him track that as he's following the target and about to fire. He see's the face of the victim (who is ON the paper) and pulls the trigger - lands the bullet square through the forehead of the newspaper victim but missing the real target.

Idea 6:
Ok ... just going to put this out there - Something RANDOM happens. A bath with a guy scrubbing himself falls through the ceiling as he's taking the shot. Not the strongest thought but hey I'd put it in anyway.

Idea 7:
Bird lands on it... bit boring though.

Let me know what you think or if any of them have potential.
Cheers lads.