When an actor works with a particular prop for years, or wears an especially... intimate
prosthetic, they develop a certain sentimental attachment to it.
But taking it home after the movie wraps? That's a grey area. It's a little like walking out of work on your last day with the company laptop; sure, Mark Wahlberg did some good work with that prosthetic penis, but he didn't pay
Here are a few famous props that fell off the back of the truck, and onto an actor's coffee table: