So, are you young, old or brainless? If I were in the right mood, I would probably let the truth come out and ask them which category they thought I was in.
What was your response to be? I am always looking for good oneliners.
By the way, some of my best friends prefer Ragu over Prego, but I don't hold it against them.
Edit: I just figured out the line is "What an interesting assumption!" I'll try to remember that.