I saw the aftermath of the Zednik incident on some sports highlights last night, him rushing off the ice. I instantly felt the colour drain from my face and two minutes later I was bent over a toilet watching my supper come back up.

I didn't actually see him get sliced open, but I got a quick glimpse of a lot of blood, and when I couldn't shake the imagery from my head I got faint and sick. Even reviewing this thread and thinking abut it again gets me kinda light headed.
(and I absolutely will not watch those linked vids for fear of making a mess all over my desk)
Some people just can't deal with it.
edit: this makes a good case for always wearing a neck guard when playing hockey. I've never understood why more professionals don't.