Misleading: This mule did not kill this mountain lion as commonly claimed. The lion was already dead before the mule attacked it. That said, mules and donkeys will attack predators. For this reason donkeys are often used to help protect sheep herds.
The first world problems meme might be a bit old right now, but first world dog problems is all new and seriously funny. Personally, I love the "I have to pee, but it's raining outside," as that's what my dog does all the time.