What is the Rarest Kill Icon in TF2?

I'm sure at one point or another you've looked at the killfeed, seen a strange-looking picture, and thought, "what in the world is that?" TF2's kill icons are pretty inconsistent, with most of the "obscure" kills being denoted by the default skull and crossbones icon. So seeing a rare kill that actually HAS a unique icon is an especially unlikely find. This video looks to find which icons are the rarest to see, both in casual and in TF2 overall.

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Outro music by liledix4: https://www.youtube.com/watch?v=6_eiit43vCE

Also, if you're wondering what's up with the kill icons in the background gameplay, I forgot I installed an icon fix pack a while ago. I personally very much dislike the default icons, but that's a video for another day.