He's been like that all the time.
2 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 01:34:50.922 in the Blu-ray version of the movie.
Quote context
[...]
- It's our responsibility, Mr. Kee.
- Oh, just a minute, Doc. I guess I got the jitters.
- It'll give him a hell of a jolt, won't it?
- That's just it. He needs a jolt to set his brain working again. You're the jolt.
- Of course, it's risky, but it's our only hope.
- We are ready to chance it, if you are.
- Thanks.
- He's been like that all the time.
- Frere, there's someone to see you.
- Hello, there. How are you keeping?
- Say, you remember me. The name is Kee, Sylvester Kee.
- Why, hello, Sylvester. I've been waiting for you.
[...]

 Dead of Night (1945)
 Dead of Night (1945)  Phantom of the Opera (1943)
 Phantom of the Opera (1943)  Scooby-Doo, Where Are You! (1969)
 Scooby-Doo, Where Are You! (1969)  Halloween III: Season of the Witch (1982)
 Halloween III: Season of the Witch (1982)  Knight Rider (1982)
 Knight Rider (1982)