I Rest My Case

Keegan: Why do you have to be 18 to change your name?

Me: Because your parents picked the name they like, so they're the only ones who get to change it.

Keegan: But why can't I change my name?

Me: You aren't mature enough to pick a name.

Keegan: But why can't I change my name to "Spiny Norman"

Me: Spiny Norman is a silly name.

Keegan: No it's not, it's from Monty Python

Me: I rest my case