Oh, you shouldn't mess with that.
4 seconds sound clip from the Jingle All the Way (1996) movie soundboard.
You can hear this line at 00:55:15 in the Blu-ray version of the movie.
Quote context
[...]
- All right, just stay there. And I'll know if you move, 'cause I have the ears of a snake!
- Oh, you shouldn't mess with that.
- Relax, Sparky. I was on the bomb squad for 10 years.
- Gentlemen, we've been duped.
- This is nothing but a harmless Christmas package.
[...]