Yes. A sense of humor.

If it's true that many of the items displayed came from the trash, I think this lacks an important part of humor: that the person be in on the joke. There's a saying that a practical joke is only good if the person on the butt end of it is laughing the hardest, otherwise it's just cruel.

This entire HN page is a performance piece. There is only one commenter who is not in on it.

I’ve been had.

So have I.

This is amazing dialog. Deserves a website of its own. You two should collaborate.

The important stuff tended to, I honestly don't find humor in criticizing amateur art, especially without a background or any info on the creator, etc.

I can definitely see how you might differ. I'm glad I'm different, even if I miss obvious things and don't get super funny jokes.