Dawning of Age

I, Brian, had a disturbing conversation with my son tonight. I was tucking him into bed when he began rubbing my forhead with his fingertips and asked me, "Dad, do I have red lines on my forehead?"
"No, you don't."
"Well, why do you?"
"I just do."
"How did you put them there?"
"I don't know."
"Why did you put them there?"
"I didn't. They just happened."
"But how did they get there?"
So I responded the only way I could: "Go ask your mother."