After I invent time travel I'm going to mail my 30-years-ago self a T-shirt that says "Colon Q Bang" on the front and "You're Welcome" on the back. It will save

After I invent time travel I'm going to mail my 30-years-ago self a T-shirt that says "Colon Q Bang" on the front and "You're Welcome" on the back. It will save myself much anguish.