Get the movie and get to the part where the two families are getting along and Matt (the dad) is teaching the mom's kids how to cook and the mom is teaching the dad's kids science experiments with balloons. They are filling up the balloons with the carbon dioxide from the pellets they put in the liquid in the coke bottle. The mom puts a blue balloon on the bottle to fill it and it begins to inflate, the camera flashes to the dad teaching the boys to cook (they are in the same kitchen)and then back to the mom and the other kids. But, lo and behold, the balloon is now pink! It could not have been the mother changing the balloon because it is half full and the camera only flashed for about 5 seconds!