Well, it was great work, kids. Thanks to you, my circus will open this year after all.

6 seconds sound clip from Scooby-Doo, Where Are You! - Bedlam in the Big Top (S1E10).

You can hear this line at 00:20:05.229 in the Blu-ray version of the episode.

Quote context

[...]

- I know that man. He's Harry the Hypnotist.

- He had an act with us, but we caught him stealing and sent him to prison.

- Looks like he wanted to get revenge.

- As a ghost clown, he knew he could ruin your circus.

- He sure had us fooled with this balloon copy of the ghost clown. You see, he inflated it with this gas cartridge, and it disappeared when he deflated it.

- Well, it was great work, kids. Thanks to you, my circus will open this year after all.

- Shaggy and Scooby sure were mysterious about this big surprise they have for us.

- I hope Scooby doesn't try that high wire act again.

- Ladies and gentlemen, presenting that Hercules among strongmen, the man with muscles of steel... Samson the Super!

- If he can lift that, he is Samson.

[...]