From the first season of Justice League Unlimited - finale, with Terry McGuiness, the future Batman, confronting an aged Amanda Waller, who recounts this story about Ace of the Royal Flush Gang and Bruce's Batman.
When news broke that the DC Cinematic Universe was stripping a sense of humor from their franchise, fans of the animated universe were confused. After all, werent jokes like these the bread-and-butter of the Justice League?
The Flash: “Hold on a second here. What about the whole “secret identity” thing? I mean, I just you guys, but I’m not sure I’m ready to…” Batman: “Wally West, Clark Kent, Bruce Wayne.” The Flash: “Show-off.”