Of course, nobody cared who I was until I put on the undies.
There are two pivotal points in a persons life. The day when a baby becomes a boy, and the day a boy becomes a man. The day you go from diapers to undies, and the day you go from undies to Calvin Klein boxer briefs.
This is also a good opportunity to go deeper into the way life comes full circle and how when you become an old man you go back to wearing diapers. It's a sort metaphor for the circle of life, life and death, and the metaphysical implications of your undergarments, but I'll save that golden tid-bit of knowledge for later.