I triple-dog dare you!
5 seconds sound clip from the A Christmas Story (1983) movie soundboard.
You can hear this line at 00:16:50 in the Blu-ray version of the movie.
Quote context
[...]
- That's because you know it will stick.
- Oh, yeah? Well, I double-dog dare you!
- Now it was serious. A double-dog dare. What else was left but a triple dare you?
- Well, go on, smartass, and do it.
[...]