Chosen answer:If you watch the commentary on the movie they discuss this, they explain that the guy who played the mom's boyfriend came up to them and just started doing that thing with the chicken and they thought it was funny so they put it in the movie.
Chosen answer: If you watch the commentary on the movie they discuss this, they explain that the guy who played the mom's boyfriend came up to them and just started doing that thing with the chicken and they thought it was funny so they put it in the movie.