Why, Why, Why?

A conversation that occurred at bedtime after reading a Batman book (of course):

"Mom, why doesn't Bruce Wayne want anyone to know he's Batman?" I'm not sure buddy.
"Mom, why does Wonder Woman need an invisible jet if she can fly?" I'm not sure buddy.
"Mom, why does Batman wear his underpants outside his suit?" I'm not sure buddy.
"Oh, I know. I bet his wein is on the outside of his suit so that's why his underpants are too."
I think it's time to start coming up with some better answers.