This one was sent through the pretty-darn-neat-lines. This flash movie is 98% about Castle Crashers from some flash movie series. Near the end though, we see our favorite pony Derpy herself in the video. You can choose to “skip to the bossfight”. It’s still literally right near the end of the movie.
[C. Crashing A Wedding on Newgrounds] Whoops! forgot the most vital part of the post!
Thanks to hound124 for the tip!