In what seems to be the final stretch of “The Dark Knight” viral marketing campaign, a time bomb is set to detonate today. What will happen? Right now nobody is too sure but it might coincide with the checklist on why so serious. The final task is to “leave a big mark” and in a few hours we’ll see just how big of a mark The Joker is planning on leaving. Click HERE to monitor the bomb for yourself and expect to see what happens at about 7pm PST.