Ghost clowns haunting circuses is a new one on me.
3 seconds sound clip from Scooby-Doo, Where Are You! - Bedlam in the Big Top (S1E10).
You can hear this line at 00:04:51.232 in the Blu-ray version of the episode.
Quote context
[...]
- Well, there's so many strange things going on.
- What sort of strange things, Mr. Barnstorm?
- Weird things, like trapeze wires suddenly coming undone.
- And then the lions... they suddenly began acting like scared pussycats.
- Ghost clowns haunting circuses is a new one on me.
- Watch the pretty coin of gold, and you will do what you are told.
- You are brave, and that's a fact. You will do the high wire act.
- Scooby Doo! Where are you? Scooby Doo! Where are you? No sign of him. Let's check in this tent.
[...]