Don't see it as plagiarism, especially if it's non-copyrighted material you chose to share. See it as knowing a good idea when they saw it. Back when I was playing "Silent Hill" games, I created a topic called "SH2 - The Rejected Endings". It had a whole slew of mostly humorous endings featuiring James, the game's protagonist. In one, James whacks the obnoxious dog with a newspaper. In another, he whacks the even more obnoxious kid with a wooden spoon. James and the entire cast of characters, dead and alive, get into a huge rumble at the end. And in one, James walks in on a party featuring the entire cast of characters, with Pyramid Head (a sex pervert slasher in a triangular mask, and the series' most iconic boss) cutting the cake with his Great Knife (like a normal kitchen knife only it's the size of a Honda Civic). Lo and behold, in Silent Hill Downpour (which came out four years after I posted the topic), the game's joke ending features... a party! And yes, the entire cast of characters is present. And yes, there's a cake. And yes, Pyramid Head is cutting it.* And yes, the game's credits verify that the game's creators were regular visitors to the site I was on. But I'm not complaining... I wrote the ending for fun, and shared it because I thought it was a good idea. And just maybe, Konami thought so as well. *He cuts the table in half as well, but I didn't come up with that part.