Shower joke............

A woman is finishing up in the shower when she hears a knock at the door. She quickly wraps herself in a towel and answers the door. It's the neighbor Bob, he says I will give you 800$ if you drop that towel. She drops the towel and he hands her 800$ and leaves. Her husband calls to her, who was that? She answers it was Bob. The husband says ,did he mention the 800$ he owes me?