Overkill medal (Halo 2)

Summary
The Overkill Medal is awarded for killing 25 opponents in a row without dying. It is available in all Multiplayer gametypes. Although this medal is not featured on Bungie's website due to its rare nature, it is assumed to have a Bungie difficulty rating of 10 (out of 10) due to the fact that to kill 20 opponents in a row has a difficulty rating of 9. This medal is very rarely seen and is represented by a 16-sided silver star with a yellow bullseye in the middle. Larger images of this medal are not available because Bungie chose to leave this medal as a 'secret' reward for those who could achieve it. This image was taken from a set of post-game stats. When you get this medal, the announcer yells "Un-Freakin Believable!"