Me: Okay, it's come to my attention that I have plagiarized this. I got the supermarket/HIV story from a friend, and I assumed it was originally his story to tell. I posted without thinking, and that was irresponsible. I'm very sorry if I offended anyone, and I am especially sorry if somehow the original writer of that joke/story reads this in the future someday.
Unintentionally or not, it is still plagiarism, and if I need to take it down, I will. Again, I'm so sorry, and I hope that you guys don't lose faith in me or my writing.