A Murder Race!
Participants would have their counts checked before the official event launch. Then they would have some amount of time to rack up murder counts, lets say 4 hours? At the end the judge would compare participant's listed murder counts to what they had when starting.
I'm sure there would be a way to exploit this with res-killing or something... maybe the murderers would have to submit screen shots of each kill? Whoever ran this event could think up more cheat-proofs.
Figured this PK-laden shard would like this one
![Smile :)](./images/smilies/icon_smile.gif)