This thread is very funny!

I like the "full, upright and locked position."

Speaking of which, don't you love the part where they say to "insert the metal fitting into the buckle?" Is there anyone on Planet Earth that doesn't know how to put on a seatbelt???

I always think of the dental term, buccal, which is the surface of the tooth that faces the cheeks, so you are supposed to insert the seat belt into your mouth