Bryan Cranston -- Neighbors Are the Ones Who Knock To Say Congrats on Emmy Win

Bryan Cranston is beloved by all his neighbors for playing a horrifying villain, and they let him know it by decorating the front of his house after his Emmy win.

After Bryan won for Best Actor ... the "Breaking Bad" star returned home to find balloons tied to his fencing and a handwritten note congratulating him.

But the thing is ... the note looks like it was written by neighborhood kids -- and we all know ... "Breaking Bad" is NOT fun family viewing.

Maybe they're just "Malcolm in the Middle" fans.