I was walking up to dawnstar past whiterun, when the dragon fight music started. Before I could look up to locate it, the bloody thing emerged from the ground in front of me, with a giant on it's back. The two of them flew off for a distance before the giant fell off and they started fighting. Best glitch I've ever seen, I sincerely hope it happens again one day

That... Sounds... Epic...
So picture this, a Cave Bear, a Sabertooth, two Draugr, a Forsworn, and a Thalmor Wizard decide it'd be a cool idea to attack Whiterun, where a powerful Necromancer (me) and a random member of the Dawnguard kill them all, the Dawnguard member thinking they're vampires. Yup, my game replaced Vampire attacks with the strangest coalition I have ever seen...