NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNBatman
(This javascript joke is courtesy of codecademy.com.)
From Batman #84, June 1954, "Ten Nights of Fear!" page 24, panel 1. Pencils by Sheldon Moldoff, inks by Charles Paris.
A typographic, designological, visulicious extravaganza!