In The Abyss, Ed Harris, after an argument with his (IIRC) semi-estranged wife Mary Elizabeth Mastrantonio, takes off his wedding ring in disgust and tries to flush it down the toilet. In mid-flush, he changes his mind and fishes the ring out of the loo. In a later scene, when an automatic watertight door is about to trap him fatally, he jams his hand in the gap as the door closes. The ring keeps the door from closing all the way, and he's able to pry it open and escape.
It's not exactly the same thing, but...
JACKSON, Miss. (AP) — Donnie Register has a new reason to be thankful he's married — police say his wedding band deflected a bullet and probably saved his life.
Two men walked into Register's shop at The Antique Market on Saturday and asked to see a coin collection, police Sgt. Jeffery Scott said.
When Register retrieved the collection, one of the men pulled a gun and demanded money. A shot was fired as Register threw up his left hand, and his wedding ring deflected the bullet, police said.