Well, I don’t have a car so I can’t honk in retaliation. The slingshot idea is brilliant–but the balloon would hit my wrought-iron fire escape first.
I’m thinking of going Barbara Stanwyck on his ass. When he pulls up, I saunter over in a veiled hat and pull a gat out of my handbag. “Listen, ya mug, one more toot of that horn and you’ll be tootin’ for St. Peter, ya read me? Now, oo-scray.”
It’s Chili Night again in Heaven? 
Go to a sporting goods store and buy a portable air horn (the kind that screws onto a compressed gas can)
Get up early the next day and get dressed.
When HHB shows up, walk out and tap on the driver’s window of his car (hold horn behind back)
When the window is rolled down insert horn and blow. Count to 5 before stopping.
Then mention that if he wakes you again with his horn you will come out, rip it out of his car and shove it up his ass.
Wish him a nice day.
All you need is a three-ton crane and shipping container full of anvils.
Set up the crane in you back yard and then suspend the shipping container over the spot where the mad honker parks. Rig a relase button on your nightstand. Horn goes off, press button. Sure there will be a loud crashing sound but it will be the last early morning noise in your neighborhood.
Fuck
And I was going to complain about not being able to watch it because I don’t have cable.
Never mind.