spacemountain said:
It's actually not from the movie but the ride. I think it is after you get off the ride but it might be when you're waiting in line. But there is a sign that says those exact words.
The reason I posted it is that the "sign" (and the theme for the entire Splash Mountain attraction) is taken from the Disney film "Song of the South".
(Never released to home video in the USA.)
The quote from the sign you posted is just a paraphrase from the film dialogue.
The following quote is taken directly from the film soundtrack (just to compare).
UNCLE REMUS: (southern dialect)
"Yes sir, honey, it happened on one of them Zip-A-Dee-Doo-Dah days.
Now, that's the kinda day... when you can't open your mouth without a song jumpin' RIGHT OUT OF IT"...
(Sings)
ZIP-A-Dee-Doo-Dah, ZIP-A-Dee-Ay. My, oh my, what at wonderful day..."
"Song of the South" is a wonderful film.
And, Splash Mountain a wonderful ride.
Too bad most folks have not had a chance to experience BOTH.