He put a tack on the teacher's chair, during class.
5 seconds sound clip from the The Incredibles (2004) movie soundboard.
You can hear this line at 00:17:54 in the Blu-ray version of the movie.
Quote context
[...]
- What?
- Dash got sent to the office again. (2)
- Nothing.
- He put a tack on the teacher's chair, during class.
- Nobody saw me. You could barely see it on the tape.
- They caught you on tape and you still got away with it? Whoa!
- You must have been booking. How fast were you going?
- We are not encouraging this.
[...]