Let it go, Shaggy. Sorry to have bothered you, sir.
3 seconds sound clip from Scooby-Doo, Where Are You! - Foul Play in Funland (S1E8).
You can hear this line at 00:07:39.442 in the Blu-ray version of the episode.
Quote context
[...]
- Well, she was sure running wide open... lights, music, everything.
- That's impossible. We're the caretakers here. My brother and I would have seen the lights.
- Well, we saw a very strange character running around out there.
- Fiddlesticks! Besides us, there's no one else on this island.
- Maybe the moonlight was playing tricks on you.
- Let it go, Shaggy. Sorry to have bothered you, sir.
- Well, how did you like that for double-talk?
- We can't go home now. We know we didn't imagine all those kooky things that happened.
- Count me out. I'm not looking for any creep with a frozen face.
- Uh-uh.
- Shaggy, sometimes I think you'd rather eat pizza pie than solve a mystery.
[...]