Okay, so here's a little bit of fun and common sense.
Have you ever wanted to duel someone, with that sense of realism behind it? Where the consequence may be... death?
This only works for Death Knights that have invested their talent points into the Blood tree.
Here's how to do it. The talent point for Death knight's blood tree.
Hysteria
30 yd range
Instant
3 min cooldown
Induces a friendly unit into a killing frenzy for 30 sec. The target is Enraged, which increases their physical damage by 20%, but causes them to suffer damage equal to 1% of their maximum health every second.
Hmm that 1% maximum health dot looks tasty.
So, after a duel, if the other person is a real sore loser about losing... bam! Instantly cast hysteria after the duel, and hes out of here. Required that hes not a healer... or he is a healer with really slow reflexes.