We had a horrible accident here in NJ a few years back where kids in a Jeep hit something like an abutment, causing several of them to fly out into the opposing fast lane, where they were quickly hit and killed by oncoming traffic. They weren’t wearing seatbelts.
I was fortunate in having a friend that worked as a dispatcher at a towing yard; you see those wrecks, and you won’t drive five blocks to the store without your seatbelt. Hair caught in the front grill of a car, brain matter in the bed of a pickup, it is disgusting but scares the heck out of you.
Nearly 20 years later, they discovered the van, upside down in some lake. The bodies, now skeletons were still inside. Some of the skeletons were still wearing the now rotten clothing.
Really creeped me out. Imagine knowing your child was down there all those years.
My parents both rode an ambulance for 14 years. They're fond of saying that they never unbuckled a seatbelt from a body.