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 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.