A good enough response to the sixth or seventh time somebody has asked you if you know what they are saying, as smart ass as it might seem.
After about the sixth or seventh time somebody has asked you if you know what they are saying, it's not a bad idea to ask them you know what you're saying? before they turn you both into one of those guys, especially if that isn't you.
Legend has it he still does not know what
I don't know why they wont let me change the plan. *long pause* Do you know what?