This is an unashamedly trivial addon that reports with a say message whenever anyone does 1337 damage to anything. If you do it yourself, it helpfully takes a screenshot of the memorable event. If you would rather your screenshots were not spoiled by your say bubble, change the third line of HaxX0r.lua to:
local sayAfterScreenshot = true
Put it in your addons folder, forget about it, and have a half-giggle every now and then!
Updated TOC for 3.1. More reliable detection if the player has done the damage, so no more speaking of oneself in the third person.