As you'll recall, Willi wanted to kill Batman for beating the snot out of his poppa, General Von Dort, an incident Batman could barely remember, but still snarkily rubbed it in Willi's face, just so:
No matter how many times I see Batman in that hat, it still stupefies.
Did you think that was just a bit of flimsy backstory crafted for Willi to give him motivation to kill Batman? Think again.
If you'll go to your local Big Monkey Comics store, then purchase a copy of the newly-released Showcase Present: The Elongated Man, and turn to page 297, what will you see?
Batman knocking out General Von Dort ...
at the climax of a team-up with the Elongated Man. Yep, it really happened in previous continuity.
Sweet, sweet continuity.