Yes. When the ghost clown appears in your circus, you might as well quit. Circus folks are superstitious.
7 seconds sound clip from Scooby-Doo, Where Are You! - Bedlam in the Big Top (S1E10).
You can hear this line at 00:04:08.685 in the Blu-ray version of the episode.
Quote context
[...]
- If I were you, I'd get out of this neck of the woods and fast!
- What kind of a jinx would make them leave the circus?
- That's too bad, Mr. Barnstorm.
- Tell me, what is this jinx anyway?
- This circus is haunted by a... a ghost clown.
- But there are no such things as ghosts, Mr. Barnstorm.
- 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.
[...]
