He might be skulking around here in any one of 50 outrageous outfits. For example, here's another one.

10 seconds sound clip from Batman (1966) - The Joker Goes to School (S1E15) TV Series.

You can hear this line at 00:11:27 in the Blu-ray version of the movie.

Quote context

[...]

- What's the crook's name?

- I can do better than that. I can show you his picture.

- What's your name, son?

- Richard Grayson, sir?

- Thank you, Richard. You darken the room, I'll man the projector.

- Roger.

- Here it is, everybody, The Joker. Don't be deceived by that grin, anyone.... He's one of the most malevolent malefactors we've ever met.

- I'll bet he's a master of makeup too.

- You're right. He is.

- He might be skulking around here in any one of 50 outrageous outfits. For example, here's another one.

- A little closer, kids, I want you to see that phony flower in his button hole. Sometimes it shoots out water. Sometimes powder. Other times, knock-out gas.

- Hey!

- Holy magician!

- Hello, kiddies, meet The Joker. And no hard feelings.

- Corny, aren't I?

[...]