Talking in code...

[Quagmire]

I think code talking is somewhat useful.

Back in my very first game of mafia, I was a mason along with two other people. During each night, we thought of a new code system so there would be a way to prove each other innocent, yet the mafia couldn't get it. At all. It was so subtle that nobody else could get it. If the chance came up, yes. We would prove ourselves.

It can be useful as long as it's subtle enough.