Like…
Using your car alarm as an alarm clock. See, it would work great: really loud, too annoying to sleep through, and you’d have to get up to turn it off.
(Yes, a neighbor got a new car. It’s alarm is set to ‘panic is a blade of grass is brushed against the car.’ :mad::mad::mad:
Leave the dog outside all night, barking, of course. After all, it’s a watchdog, to protect them from burglars. What burglar will come up to a house with a barking dog?
I once had a neighbor who car-pooled to work. Her ride would pick her up every morning between 6:30 and 7:00 am, and honk the horn to let her know she was there.
I’m sure I’m not the only neighbor who really, really appreciated that wake up call. Even more pleased was my roommate, who worked as a waitress, often didn’t go to sleep until after 1 or 2 am, and whose bedroom was at the front of the house about 10 feet away from where the car would pull up.
Publish a book describing how you might hypothetically have carried out a murder you were acquitted of.
If it’s an obnoxious alarm clock you want, use a town’s tornado or tsunami warning system.
Become a teenager? 16, 17, and 19 year olds in the house (the 19 is OK).
Our current neighbor hates yard work so he took this Agent Orange-like chemical to his entire yard - and with the rains and all this spring, the chemical and his mud keep migrating to our yard.
C’mon, let’s keep it realistic here. No one could be that much of a dick.
You could take pictures of a co-worker slacking off and then make a Powerpoint presentation for the boss titled “Employee of the Month.”
Hypothetically speaking, of course.
Go around with a tube of super glue and squeezing it into the key hole of car doors, though most people have a remote for their locks now this would probably only work with older cars. Mess up that pretentious turd down the block who’s always washing and waxing his vintage Chevy.
Go to lines of people waiting for a new movie or book and shout out the ending
At night, get eggs and go out to your back yard. Hurl them as hard as you can at random houses
Recruit, train and dispatch suicide bombers.
How about a morning wake up involving some kind of configuration of an open litter box and a fan?
I read this as shoot out. Which would also be pretty obnoxious.
It’s heartening that this thread only has a handful of suggestions. If I choose to think of it that way.
How about, hiring an orchestra to stalk someone and play disquieting music as they go about their everyday life? If the target goes swimming, give them a rendition of the Jaws theme. Every time they take a shower, Psycho. They get on a bus, Ride of the Valkyries.
People that wipe their boogers (often smeared with blood) on the walls of stalls in public bathrooms.
Actually I think that would be totally awesome! I could have my own theme music! When I walk into a room they can play ‘Thus spoke Zarathustra’. I’d want ‘Another One Bites the Dust’ played when I’m in the bathroom, and the theme to Shaft when I’m out on a date! 
Set their cars to honk the horn each time they lock the doros. You can’t really appreciate how annoying this is until you share a property line with a 7/11. 24/7, 365, my life is puncuated with everythign from the little chirrup to the full-on Honk!
I really need to move.
People who park in handicap spaces and at bus stops. And who use the handicap rest room stall if there’s a handicapped person waiting behind them.
Wire up a fellow nurses alarm clock so that it sounds like an IV pump alarm.
Put hanging bait on the exhaust manifold of someones car.
Pick someone random, start following them. When they turn around, catch yourself and pretend you’re looking into a store window or something. Maybe duck behind a lamppost. Repeat.