4. The Joker versus the IRS
The Joker appears to most children like an awful person who might do pretty much anything or go up against anybody. Be that as it may, there’s ONE group which he won’t go up against: the IRS. In “Joker’s Millions,” he makes a passing remark about how he generally pays his taxes. That’s because while he’s sufficiently insane to battle the Batman, he won’t go up against the IRS.
5. It’s a Wonderful Life… Although Not for Batman
In “Christmas with the Joker,” there’s a continuous discussion between Robin and Batman about how Batman had never watched the Christmas classic It’s a Wonderful Life. Why? That’s because Batman would never move beyond the title, and how it absolutely contrasts with his own backstory.