Well! It's Wily Wily, the Wily Trout.
6 seconds sound clip from The Yogi Bear Show - The Stout Trout (1958) - S01E11 TV Series.
You can hear this line at 00:02:31 in the Blu-ray version of the movie.
Quote context
[...]
- But even the cleverest fisherman can't always be sure what a fish might bite at.
- The fisherman's favorite lure is the fly. Preferably dead.
- Even fly-fishing is fraught with dangers.
- And speaking of danger... what's a shark doing in a freshwater lake?
- Well! It's Wily Wily, the Wily Trout.
- Which proves that even trouts have a sense of humor.
- A good fisherman keeps cool, calm, and collected. Well, cool and calm... at least calm. Oh, well..
- Of course, every angler has caught at least one old boot. After all, it felt like a fish.
[...]