I'm thinking of smiling if my father dropped dead right now
Thats awful. Why would you be happy if your father died?
I don't know, I just suddenly thought of it
It's wrong for a child to wish the death of their parent, as the parent brought them into the world. Try to talk to your dad about this and see if you can find some unresolved conflict.
It's alright. Maybe I'll just make a witty comment at his funeral.
It sounds like you have a problem with your father. You should probably find a professional to discuss these issues since they aren't normal. You might think you'd be happy if he was gone but there are moments in your life where you may want him around.