Well, his scaring days are over.
2 seconds sound clip from Scooby-Doo, Where Are You! - Hassle in the Castle (S1E3).
You can hear this line at 00:19:49.255 in the Blu-ray version of the episode.
Quote context
[...]
- This? This is the end of the mystery.
- Well, well... if it isn't our old friend Bluestone the Great, an ex-magician wanted in six states.
- But what is he doing Haunted Isle?
- He must have heard the legend of the Vasquez treasure. Everybody's after it.
- And when he saw us run aground, he wrote a threatening message trying to scare us away.
- Well, his scaring days are over.
- The Great Bluestone is going to do a final disappearing act, courtesy of the local jail.
- There's one more thing. We figured out all those floating tricks. Watch.
- But how did you walk right through a solid wall?
- One of my best acts. Let me give one last performance. Hold this rope.
- I must admit, Mr. Bluestone, you're a good magician, but a bad phantom.
[...]