Honk if You’re Happy!
When you own your own home, there are so many things that now become your responsibility. Whereas before, when you were just renting, you could tell your landlord all your house problems and they would have to legally come and fix all of the problems you have.
This doorbell situation is a classic thing that happens all the time, but when you have to fix it yourself, there is no way you will. So you think of the next best thing, which is apparently a car horn for the people that live in this house. Still a good solution, either way.