Edit: You are really going to like this thread. I know not EVERY GIF fits the thread exactly, but it is a collection of awesome GIFs so enjoy!
Everyone loves a spinning backfist KO or a flying knee KO, but it could just as easily backfire. What are your "risky strikes gone wrong"? It could be a failed attempt at a strike, or a strike that totally backfires on the fighter as well. No celebration GIFs.
All of MMA, not just UFC. Here are some of mine:
And last but not least, Matt Riddle:
Post yours, and which one you think is the worst. I think the Arlovski one is the worst.