Until one day, while performing spectacular feats of stratospheric skill never before attempted by civilized man, an unfortunate phenomena occurred.

11 seconds sound clip from the The Wizard of Oz (1939) movie soundboard.

You can hear this line at 01:32:59 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, will you? Could you? Oh!

- But are you clever enough wizard to manage it?

- Child, you cut me to the quick!

- I'm an old Kansas man myself, born and bred in the western wilderness...

- Premier balloonist par excellence to the Miracle Wonderland Carnival Company.

- Until one day, while performing spectacular feats of stratospheric skill never before attempted by civilized man, an unfortunate phenomena occurred.

- The balloon failed to return to the fair.

- It did?

- Weren't you frightened?

- Frightened? You are talking to a man who has laughed in the face of death, sneered at doom and chuckled at catastrophe. I was petrified.

- And suddenly the wind changed and the balloon floated down into the heart of this noble city where I was instantly acclaimed Oz, the first wizard deluxe!

[...]