Little does she know she's to be my next victim.

4 seconds sound clip from Batman (1966) - The Thirteenth Hat (S1E13) TV Series.

You can hear this line at 00:08:08 in the Blu-ray version of the movie.

Quote context

[...]

- But, at the same time, in this old building which doubles as a warehouse and the secret hideout for the Mad Hatter and his slippery stooges...

- There. Two more to go. And the dummies of the conniving jury that convicted me will, at last, be properly topped.

- How whimsical, Jervis.

- Thank you, Lisa. It's a pleasure to share my moments of triumph with you.

- I'm supposed to be on my coffee break. At least, that's what I told Madam Magda.

- Little does she know she's to be my next victim.

- Oh, how merry, Jervis.

- Before we get to the next victim, when do we get the next meal?

- Gettin' bonnets for these dummies ain't filling our stomachs.

- Or our wallets.

- Our wallets will be filled, boys. As soon as I've completed the most fantastic hat snatch of my glorious career.

[...]