My flight attendant today was the most memorable ever. He said, and I quote, "If you don't like our service today, this plane has six exits." I couldn't stop laughing. There after, every time he announced something I listened attentively. He reminded me that any message, any thing that is consumed regularly loses its appeal to familiarity. You don't have to change everything about yourself, your message, etc. but at some point you do need to shake things up a bit, even if only for a while.
Everything that lives changes and grows, why wouldn't you?