Ok, I was cleaning my bike today, and I got covered in grease. This is how the exchange between me and one of my girl friends went.
Me: "Gee, I am dirty."
Her: "Yeah you are..."
Me: "While I appreciate the confirmation, it wasn't necessary. I'm just saying that I'm filthy."
Her: "Yeah you are.."
Me: "Again, not needed. I've gotta take a shower later."
Her: "Maybe I will too."
Me: "Thanks for the update. Wow, I never thought a bike could be that dirty... I need to soap myself from head to toe. "
Her: "Yeah you do."
This went on for about 2 minutes before I got the joke.