I don't have a best kill because, because all my kills are glorious. Everytime I remove my blood soaked blade from an enemies skull I give it a sweet lick and a kiss; 'Matilda', i've named my blade.
My best death, however:
The desert bridge map, the one with the wide bridge that ascends on both sides but there is a gap in the middle, and one team needs to make the first move and jump over the gap. In this instance, four players from each team decide to jump over at the exact same time. We fall down the gap. We all laugh and die.