- There's only one person who could have done that.
- The mummy!
- Mummy!

— Velma Dinkley (Nicole Jaffe)

5 seconds sound clip from Scooby-Doo, Where Are You! - Scooby Doo and a Mummy, Too (S1E12).

You can hear this line at 00:04:50.116 in the Blu-ray version of the episode.

Quote context

[...]

- Come on. Grab the sandwiches, and let's go.

- Yeah. Like, I can't wait.

- Liverwurst and ice cream! What'll they think of next?

- Professor! Professor, we're back!

- Hey, Professor, why are you sitting in the dark?

- I'll get the lights.

- OK.

- Professor!

- Zoinks!

- What happened to him?

- Like, he's turned into 14-karat stone!

- Stone?

- There's only one person who could have done that.

- The mummy!

- Mummy!

- Let's go check.

- Velma's right. The mummy's not in the case. It's gone!

- And, like, right out through that glass door.

- Wait a minute. If he went out the door, how come the broken glass is on the inside of the door?

- You're right, Velma. There's something strange going on around here.

[...]