But what is it, Joker?
3 seconds sound clip from Batman (1966) - The Joker Goes to School (S1E15) TV Series.
You can hear this line at 00:18:10 in the Blu-ray version of the movie.
Quote context
[...]
- Rhinestone bracelet. A fox fur stole... And one full quart of imported Mexican perfume.
- Oh, gee, Joker. I'm sorry I sassed you.
- Why, this is like some lovely dream.
- Ah! Perfect! Stolen right from Schoolfield's safe.
- The key card to my malevolent machination.
- Look, you boobs. Look and laugh.
- X plus Y times X plus Y... Holy alphabet, what is it?
- If you'll excuse me, Master Robin. The solution is X squared plus 2XY plus Y squared.
[...]