I once had a coworker who would start every response to people with, "Yeah, I know..." Conversations were similar to this:
Me: I really don't want to work on Thanksgiving eve night.
Coworker: Yeah, I know but we won't celebrate until Saturday so it's okay for me. That will give me some extra shopping time.
Me: Are you cooking a big meal Saturday?
Coworker: Yeah, I know. It'll be smaller than usual since my daughter can't make it in this year.
She was a very nice lady but since she used that phrase so much, it drove me crazy.