So skip forward a few hours and I load up a save from right before confronting Harkon in the chapel.
Anyway, he was talking to Serana, getting his "I am an awesome villian" talk on and I sneak around behind him, fire off Auriel's Bow right into his back, aiming for where it will pierce his heart and the reaction was pure gold!
The guy cuts off mid speech to scream in anguish, teleports around the room a few times (screaming the whole time) then ports to in front of the altar and has his death animation.
Don't know what I was expecting but my character just stood there in shock while I myself was having a laughing fit. I really didn't expect that to work.
Second would be taking on Mercer Frey. The same character had not fed in a few days, so when confronting him, he ran towards me, a meter away from me I cast Vampire's Seduction, feed off him then summoned a pair of dual Bound Swords and immediately went into that badass animation where you get them on their knees with both blades on either sides of their neck and cooly behead them.
Any similar stories to share?