That's from Neopets.
It's not important.
If one gets the joke, it's like "passing a test," but if one doesn't get the joke life can still continue, the sun will shine, people will play and eat...
It did remind me of "...To Get More Jokes," though and I should link that with it. Here's a quote about an epiphany-esque moment when I was teaching:
I would be asked "Why do we have to learn this?" Sometimes I gave a serious answer, and sometimes a philosophical answer. Sometimes I made light of it. Sometimes the honest answer was "You don't have to learn this, but I have to try to teach it so I can get paid." Or "Only some of you will need to know it, but they don't know which ones yet, so I have to say it to everybody."
Then one day, the question came phrased a new and better way: "What is this GOOD for?" The answer I gave then changed my life and thinking. I said quickly "So you can get more jokes." I think we were reading a simplified Romeo and Juliet at the time. I could've gone into literature and history and fine arts, but the truth is that the best and most immediate use of most random learning is that it illuminates the world. The more we know, the more jokes we will get.