Adoption delay

On his 16th birthday I thought my son deserved the truth about his being adopted.As he came in from college, I said gravely
"Tom. Do you mind sitting down, I've got something to tell you."
"Dad guess what?!" he exclaimed.
"Tom, this is important." I urged.
"No way dad listen!"
"Tom. Please. Don't make this hard for me. It's about your mum and me."
"Dad! Shut up! I've just won £250,000 on a scratch card!"
"That's amazing son! Your old Dad's really made up for you!"