I am a rubber bullet, so I just bounce of whatever I hit.
The next user comments "first!" on a youtube video.
Fortunately, I don't have a Youtube or Google+ account, so I can't comment at all.
The next user gets hit in the eyes by a high-powered laser, resulting in permanent blindness.
I learn to live with it.
The next user falls in front of a hungry pack of wolfs.
:D Yaaaaaay my wish came true! Now to navigate this to the north pole somehow...
(Trust me, you don't want to see my Christmas wish list...)
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The next user gets a 20 mile diameter thermonuclear missile through their window for Christmas.
I use water. It's super effective!
The next gets the middle finger from Santa.