Yes, it's another BATMAN line! Which episode? I'm not certain of the title (haven't seen it in decades!), but it's a Joker segment.

Speaking of bloopers where you don't want to get the order of the words wrong, Basil Rathbone used to tell the story of a live Sherlock Holmes radio broadcast where he was supposed to say, "Watson, the board of directors is nothing but a hoard of bores!" "That," said Rathbone, "is not how it came out."