You're slipping, Batman.
4 seconds sound clip from Batman (1966) - A Riddle a Day Keeps the Riddler Away (S1E11) TV Series.
You can hear this line at 00:09:47 in the Blu-ray version of the movie.
Quote context
[...]
- Too bad we didn't get a chance to paste The Riddler.
- We might yet. Don't forget I placed a homing transmitter in the band of that tiara.
- It'll lead us right to his hideout.
- Holy sewer pipe! What's he up to?
- I knew it was a phony crown all the time.
- Riddle me this, crime fighter. What room can no one enter?
- If you figure it out, look for another royal riddle in this crown.
- That ends any chance of tracking him with the homing device. Shall we after him in the manhole?
- We'll never find him. There're hundreds of tunnels down here.
[...]