No. Sorry, chum, but you can't work this show unless you're a puppet.
5 seconds sound clip from Scooby-Doo, Where Are You! - The Backstage Rag (S1E9).
You can hear this line at 00:06:56.298 in the Blu-ray version of the episode.
Quote context
[...]
- Look. He's working a puppet.
- Could be another clue for us, all right. Let's go inside.
- Hello.
- Well, hello. What can I do for you?
- We would like to inquire about arranging an audition for our trained dog.
- He's a great talent. Do a bit, Scooby.
- Well, that was pretty good. What do you say, Johnny?
- No. Sorry, chum, but you can't work this show unless you're a puppet.
- You're very good. Are you a puppet master?
- Oh, my, no. I just fiddle with them as a hobby.
- Well, you certainly seem professional.
- Well, why not? The great Pietro has helped me.
[...]