Actually, there were two T.G.I.F. candidates from Batman #656, a comic I enjoyed immensely. I also loved the sequence as the ninja man-bats attack that ends with "Ninja man-bats. Alarming twist."
This panel wins out for it's sheer balls and willingness to be completely over-the-top and off-the-page. For that brief panel, I could hear the voices and the soundtrack, as the Hammer Horror Batman came to life right in front of me. It's also, of course, bringing the Lichtenstein pop-art that decorates the earlier scenes right into the comic itself. It's bold and fun, and made me smile.