I didn't know there were any left.
4 seconds sound clip from the The Omega Man (1971) movie soundboard.
You can hear this line at 00:50:57 in the Blu-ray version of the movie.
Quote context
[...]
- This is the man, and I mean the man. But he's cool. it's okay.
- This is it. That's all there is. At least all we know of.
- There are others, I guess, if Matthias and his brethren haven't killed them all.
- I didn't know there were any left.
- And I see you got the mad scientist.
[...]