I knew I was sharp... but this pointed head is too much. Ha ha ha!
6 seconds sound clip from Scooby-Doo, Where Are You! - Foul Play in Funland (S1E8).
You can hear this line at 00:05:08.169 in the Blu-ray version of the episode.
Quote context
[...]
- That was no ghost. He looks more like a man from Mars.
- Wow! Look what that last hot dog did to me!
- Hee hee hee! Look at me! Hee hee hee!
- I knew I was sharp... but this pointed head is too much. Ha ha ha!
- That's no giant mouse. It's only a little mouse. Ha ha ha!
- Whoa! Scooby Doo, where are you?
- What do you say? Let's go find the others.
[...]