A lion cub feasting on the carcass of a dead buffalo at the Kruger National Park in South Africa managed to get his head trapped in the animal's butthole, presumably while going after the really good meat. He tries to free himself for almost five minutes before growing too weak and just laying there, possibly unconscious. Apparently there was enough oxygen in the animal's keister for the cub to survive though, because the cameraman said they returned the next day and the rest of the lion pride had eaten around the buffalo's butthole and freed the cub. Hopefully, Simba learned his lesson. "Which is?" Always save the anus for dessert.
Keep going for the video.
Thanks to Andreas, who prefers to start feasting at the head of the buffalo and work back.