Anticipating a young boy's boredom should be an easy task. We then could prepare by packing up some books and appropriate toys and assigning ourselves the position of entertainment director. It is the parent's duty (and privilege) to teach our children proper behaviors, but at the same time remembering their age. Still, parents should not dismiss their duties by saying things like, "he's only five, and five year olds shoot their mashed potatoes across the table". Rather, we should teach our kids important lessons, manners of course being one of them*, but know that teaching is an ongoing process, and for them to be good learners, we need to be good teachers.
[*and how to share, respect for women, and kid-like problem solving, just to name a few...]