You couldn't spell difficulty if your life depended on it.
4 seconds sound clip from the Matilda (1996) movie soundboard.
You can hear this line at 00:48:10.784 in the Blu-ray version of the movie.
Quote context
[...]
- Sit down, you squirming worm of vomit!
- Get up!
- Miss Honey taught us how to spell a long word yesterday. We can spell difficulty.
- You couldn't spell difficulty if your life depended on it.
- A poem, how sweet. What poem would that be?
- Mrs. D, Mrs. I... Mrs. F-F-I Mrs. C, Mrs. U Mrs. L-T-Y.
- Why are all these women married? Mrs. D? Mrs. I?
- You're supposed to be teaching spelling, not poetry!
[...]