meembo, first of all, I'm very sorry for your and your son's loss! No matter how well or how little you knew this young man, I know that the accident and death have had an effect on you.
Just last week I attended one of the most difficult funerals I've ever been to. It was not for someone I knew, but for her mother, that I attended. You see, one of my coworker's daughter died in an auto accident, driving to work the Sunday after Thanksgiving. She was only 21. I can't imagine the depth of my collegues loss! The amazing part of the funeral was when they read from the girl's journal. It seems she had visions (dreams) of her death occuring in the manner it did and of meeting God. She even went as far as to picture the clothes she was wearing and happened to be wearing the shirt mentioned in her journal, just that day.