I don't know how he does it, but there's no tack before he moves and after he moves, there's a tack. Coincidence? I think not!
10 seconds sound clip from the The Incredibles (2004) movie soundboard.
You can hear this line at 00:14:18 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, then how do you know it was him?
- I hid a camera. Yeah, and this time, I've got him.
- See? You see? You don't see it?
- He moves! Right there! Wait, wait! Right there!
- You and your son can go now, Mrs. Parr. I'm sorry for the trouble.
[...]