Just don't ask him "Who's your daddy?" in bed. In fact, just don't mention parents at all.
The Penguin's gonna sleep with the fishes.
Video Batman Chooses His VoiceNovember 08, 2011
You don't get an awesome gravelly voice on the first try.
Welcome to a future where Bruce Wayne is an old man, yet Batman cartoons are still the best.
It was a dark and stormy knight.