this is why I absolutely love this, it has a Diogenic quality. I've always really disliked how churches and funerals lull people with their bog-standard speeches and an hour after the funeral everyone's bickering about the news or who gained ten pounds of weight.
A death is a great opportunity to shock people out of their everyday stupor, and when my grandfather died who was always somewhat of a trickster, he asked to put a recorder into the coffin with a sort of knocking sound that should play when he was lowered into the grave. Obviously everyone completely freaked out and half of the people were mad but I laughed my ass off.
I think this is life affirming and when you can shock some people and have something they ought to be reminded of a funeral's the time to do it, they'll probably remember it for a long time.