"I am Batman" and its variants like "I am Batman, bitch" are quite popular. Using this, Bruce Wayne has revealed his secret to his girls.
However, I am interested in the dialogue when it isn't intended to reveal his secret identity (when he is Bruce) or it isn't intended for introduction (when he is Batman).
When (and in which comics) did he (Batman; not Bruce) use it to boast his iconic figure for the first time (when everyone already knows who he is)?