We currently have a fully operational Sarka car (still have it and reproducible every time if you want to investigate).

After a player logs in, and within reasonable distance of the Sarka, you will hear a distinct glass smashing noise. It's very loud and disturbing and scared the s*1t out of us the first few times it happened (still does catch us off guard sometimes!).

This sound will play every time, within the first 30 seconds of logging in and happens to my friends also, so not just me!
I think it is highly likely linked to the passenger door which is in "damaged" status, with no window present. When I replaced the passenger door with a pristine one, the sound stopped happening on login.