I once jumped of a cliff, onto a dragons back, and it started flying. I then proceeded to glitch ride it and fall of onto the ground with a tiny bit of health left. I then proceeded to look down and realized i was on mammoth. I ran as it chased me, straight into whiterun. I was then attacked by the entire city because I had a large bounty on that I forgot about. I ran out of town and kept running until I hit Riften, where I was killed by an invincible Jarl Blackbriar who was glitched out on attacking me :( it was fun...