Are you serious?

I tend to say this frequently, often in really dumb moments but for some reason I am more annoyed when other people say it to me.

Case in point. I am hearing impaired - which means my hearing is impaired.  So when you are talking to me the conversation may go something like this...

Child: "Ma - mumble, mumble, mumble."
Me: "What?"
Child: "mumble, mumble, mumble."
Me: [moving closer] "Huh?"
Child: [very loudly while sucking his teeth] "Are you serious?"
Me: "Why the fuck wouldn't I be serious?  You think I have nothing better to do than stand here and say what and huh?  Speak the fuck up."

another example of this would be:

Me: "Did you hear so and so passed away?"
Person: "Are you serious?"
Me: [blank stare..]


There are just times that "Are you serious?" doesn't fit - and again I am guilty as well, with that said, here are some other responses you may consider using (and by all means add some in if you have any):

O*M*G (I think this is the one child above should have considered.)
You shitting me?
Please, don't tell me that.
Damn, that is messed up.
Oh No!
No way!
How?
Really?