You gotta pry the button out with your thumbnail.

Our doorbell gets stuck every time someone pushes it. And then you gotta pry it out with your thumbnail or else the sound of the doorbell will turn into a grinding buzz in the kitchen (where the speaker is). So when someone comes and rings the bell, we need to stop what we're doing and fix the button. When we come home and hear a tell-tale, hard-to-locate buzz, we know someone has come by and pressed the doorbell.