Today my son was going to the bathroom and my husband and I were standing just outside the bathroom waiting. All of the sudden, the boy, looking down at himself, declares, "My penis is getting bigger, like yours, Daddy!" He turns toward us and said, "and it's still growing -- in 2 weeks, it's going to be this big!" holding his arms out as far as they would go.
He was just so proud that he noticed himself growing bigger... in all respects! (Please note that he was noting general growth, not an erection.)
I was in hysterics.