I agree. Somber is a very interesting choice of words. What happened at the pizza party so as to cause a mood "so shaded as to be dark and gloomy" ?
One might speculate from this if its possible the pizza party goers have made some sort of pact or are mutually involved in covering up something terrible that has not been discovered yet. For example; they all return from the bar to the Van Dam home drunk and on drugs and then find out one of them has killed Danielle. Everyone points fingers at each other and before you know it, someone cooks up a plan. Then everything spins out of control from there.
Or DVD comes downstairs with a attitude and a hot temper, throws ice on the party. Everyone becomes somber and leaves. DVD then tells BVD what happened and what she is to say.
I still find it unbelivable that neither mom or dad checked in a 7 year old for 12 hours. And that they woke up, had a wonderful breakfast with their two children, then noticed one was missing.
Something happened in that house, the VD's know what it was and are covering to save their asses. DW might have some involvement but I doubt it.
Damon could have single-handedly rained on every one's parade. Seems they type, no?