1. Shooting a dragon's corpse with any projectile spell
2. Trolling a troll (Fus Ro Dah off a cliff)
3. (Master Pickpocket) Taking the clothes off of people's backs
4. Becoming etheral and jumping off the Throat of the World
5. Shouting "Storm Call" in the middle of town
6. Freezing an enemy or companion and watching them roll down a large mountain
7. Taking advantage of the step-traps to watch enemies get thrown across the dungeon
8. Watching poor friend AI run into the step-traps and becoming incapacitated, then get frustrated after doing it about 60 times.
9. Mess with the giants and run from them
10. Turn into a werewolf, use your power attack, and watch the giants fly 30 feet
11. Let the giants launch you 1,000 stories high
12. Let your companion get launched 1,000 stories high by a giant, then try to find their corpse.
That's all I can think of right now, let me know if you have found some different ones!