The secret? "You're absolutely right!" Say this enough times and you can change anyone's mind, as Dale Carnegie noticed 90 years ago already.

So true.

My son wanted to wear his undies on the outside a la Captain Underpants and I tried war gaming this with him - hmm, so your undie on the outside is going to require another one inside your pants and we are out of fresh pairs etc etc. In the end, he gave up on the idea of mimicking Captain Underpants.