I tend not to be too sadistic, but I do remember duelling a shit-talking rogue in WoW who was looking for easy duels. He would only accept duels against people he thought he could beat, so a supposedly easy mark was me, the holy-spec PvE priest. I had seen his gear and it was reasonable PvP but nothing outstanding and I was pretty good at surviving through a stunlock so I put myself up for the duel.
He accepted and I switched to my Benediction (a level 60 unique priest weapon from old school vanilla WoW that has a really cool trail effect as you run around) and then waited for him to try to kill me.
The fight went down as you'd expect any cocky rogue vs suspiciously-engaging-in-PvP-as-holy priest - he just couldn't get through my healing. Even if he'd gone with wound poison he wouldn't have managed to, but he went for big numbers of course!
Sure he'd get me down to about 30% health while I was stunned, but my HoT, shield and my Prayer of Mending were easily keeping me up, then I'd fake out a kick with my shadow school, then immediately do a greater heal while he stood there slashing away, making no attempt to avoid his pushback or go for a quicker heal. If it was a crit heal it would fully heal me, if not then it would get me most of the way there.
I didn't bother putting dots on him - I just whacked him with my Benediction while typing /laugh
Benediction does very little melee damage
Lesson of the day - if a really weedy looking priest in a dress challenges you to a fight, he's either crazy or maybe he knows something you don't? (Or maybe Blizzard made PvE healers who stacked spirit back in BC a little too good).
I carried that sort of nonsense duelling into Wrath, although it was less effective - I had a holy/disc dual spec, although I would often duel in holy spec while wielding the
Dark Herring http://www.wowhead.com/item=44703 which is a fish. I enchanted it with
Executioner at great expense, and was most annoyed that it did not have the enchant glow (however, it did proc!). There is nothing like killing someone with a fish as they desperately try to kill you with their best gear.