I have a very dark sense of humor, and the fact that I am involuntarily bluntly honest I upset people quite often. I have joked about girls having cankles(calf-ankles), accidents, deaths of relatives.
If I don't have somebody with me to calibrate my "appropriateness meter" I can go overboard.
I made a fake facebook of my friend to jab at him for quitting, and it ended up being very dark with photo-shopped pictures with emo stuff written everywhere. I thought it was funny but my other friend saw it and freaked out that I should take it down before the person its modeled after sees it because apparently it was very brutal.
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"In the end, Darwin always wins" - Me