Page 4, Joker breaking the fourth wall. Actually he isn't, since he began the comic addressing the reader so in fact he is simply framing and telling a presumptively fictional story. But the ignorant 250,000 call that chestnut breaking the fourth wall. Explains why they still buy Marvel and DC if that's their height of intellectualism... But I digress.
You know, people aske me all the time,
"Joker, before you puncture my eardrum with that frozen cheese stick, you simply must tell me -- how do I know if I'm part of a crossover?"
"Well," I answer into their good ear, "Look for tantalizing cover graphics and unusual guest stars. These might be accompanied by the sound of train derailing."