The last one I saw was a year or two ago.
It was a Warhammer Fantasy game. We were visiting an island that had been discovered several years previously and then colonized. However, contact was cut off and we'd been sent to investigate. We discovered the island had numerous cults, and most humans (but not demi-humans) had gone mad.
We found some glowing rocks. Now, our non-magically inclined, poorly-educated PCs interpreted the rocks as being evil. One PC tried to keep them to himself, although his sole motivation was probably profit. We didn't agree. Violently.
The player stormed out as we killed his PC in only two rounds. (He was back the next session, though, with a new character.) Ironically another PC then did the exact same thing, about five seconds later -- locking them into a box, though -- rather than follow my PC's suggestion of throwing the rocks into the sea. Having just offed a PC, we weren't in the mood to do it again, but ill will was felt around the table.
Still don't know why not one but two PCs couldn't just let go of the rocks. If my character had any larcenous or stealthy abilities he would have stolen the box and thrown it overboard. I don't recall what happened to the rocks, but I think "logically" our PCs would have gotten rid of them, fast!