Amazing photos of a mule giving a mountain lion the business.
Link
UPDATE: D. Christian Quezada says: "the recently posted photo of 'mule killing mountain lion' is likely a deceptive description. The Urban legends site has a breakdown of the various narrative incarnations these photos have been accompanied with through their adventures in and out of inboxes. Most likely its a mountain lion killed by gun, then toyed around with 'post mortem' by mule. No genuine ass kicking involved." Link