Jimmy Kimmel is known for his outstanding sketches involving children on “Jimmy Kimmel Live” — like telling kids their parents ate all their Halloween candy. So check out this one where he hooks kids up to a lie detector to find out if they’re “naughty or nice” for Santa Claus this year.

The lie detector is fake, of course, but the kids don’t know that. Ha. The Truth Fairy is there to lend extra weight to the whole exercise.

Six-year-old Fletcher hilariously rats out his four-year-old brother Sammy for tackling him too hard, so Kimmel brings in Sammy, who cops to the whole thing. But then Sammy rats out Fletcher for biting him.

We can’t wait to mess with our kids like this.