I've got a funny DnD home brew story.
We had decided to start up an OPplznerf campaign using characters from a previous campaign who hit the level 20 wall. The party went through this Academy thing that unlocked their abilities to go higher and higher in level. One of the characters in party was an elven mage who had dumped all of his stats except intelligence. He was a sickly, frail, uncharismatic, and incredibly dimwitted elf that could wreck your shit with mind bullets. At his belt was a satchel of rocks, minerals, and the essences of various elements. When casting physical summon spells, like having a rock from somewhere else fly and hit something, he would reach into the bag and grab whatever it was he wanted to have thrown.
If this is confusing, I do apologize because I wasn't quite paying attention. The player of this wizard had the worst body odor I've ever come across and I spent more time just keeping my airways clear than listening.
We get to this museum place about 3/4 of the way through the campaign. As a rogue, I stole everything not nailed down and handed off some of the more magical stuff to the wizard while the paladin player argued with the GM over arresting me.
One of the things I gave was a chunk of lunar ore. During a fight, he does a physical summon and throws the chunk of lunar ore at some beast outside BBEG's castle. Nothing happens, and we proceed to finish killing it. The mage player, Mike, proceeds to argue with the GM over his spell not having any effect. GM checks behind the screen and says, "Oh, no, it's working, just not quite yet." Mike shrugs and we continue into the castle.
We make it to the final boss, go through the monologue and start fighting. About halfway in, the sky suddenly darkens and the air heats up with an incredible roaring. We look up. Here comes the moon in a fucking colony drop. The chunk of rock thrown at the beast caused the planets moon to come crashing down. TPK, naturally, and the world ended in a cataclysm as yet unseen.
Found out later ithis was intentional on the GM's part. Mike had spent most of the sessions power gaming and ruining the GM's fun, so he pulled off a classic, "rocks fall and everyone dies" on a grand scale.