It happens every time! They all become blueberries.
5 seconds sound clip from the Willy Wonka & the Chocolate Factory movie soundboard.
You can hear this line at 01:12:48 in the Blu-ray version of the movie.
Quote context
[...]
- I feel funny. I'm not surprised.
- You're blowing up like a balloon!
- Somebody do something! Call a doctor!
- Stick her with a pin. She'll pop!
- It happens every time! They all become blueberries.
- You've really done it this time, haven't you, Wonka?
- Oh, well, I'll get it right in the end.
[...]