This is the happiest day in my life.
4 seconds sound clip from Darkwing Duck - Beauty and the Beet (S1E3).
You can hear this line at 00:18:00.605 in the DVD version of the TV Series.
Quote context
[...]
- Oh, good boy, Spike. Now go fetch.
- Whew! Thanks, DW. I thought we were plant food there for a second.
- Ha! No puny plant's gonna get Darkwing Duck.
- Now come on, Launchpad, we've got some gardening to do.
- This is the happiest day in my life.
- Don't worry, my sweet pea. I've taken care of that little problem.
- Oh, but I don't want to be a plant.
- Well, don't worry. You'll grow to love it. But first, you'll grow leaves.
[...]