I have this recurring dream, well more of a recurring dream moment. Every few weeks or so I dream I hear the doorbell. It's loud and jarring and I wake up. I, of course, think it's my actual doorbell. It's happened enough times that I pause for a second to think about the likelihood of it being real, and to consider whether I really need to run down from the 3rd floor to open the door. I've finally recognized it as being higher pitched and faster than my actual doorbell.
It's still annoying.