I think they've done this a few times. This time it happened in Superman #18. Clark took off his outer clothes showing everyone he's Superman. He made a big speech saying he wanted the truth to be out there. Seems like a dumb and overdone story idea to me,but I'll keep reading anyway.
"Because shut up,that's why!"
Doctor Who getting impatient with Amy
"Well,whenever I'm confused,I just check my underwear. It holds most answers to life's questions." Abe Simpson
I can tell by the position of the sun in the sky, that is time for us to go. Until next time, I am Lothar of the Hill People!