I posted a question related to sphere packing and kissing numbers a few weeks ago. My excursion has led to a bit of humor from my son. I thought some of you might enjoy this.
With typical 8 year old bravado, my son occasionally asks me to pose "hard" questions for him to answer. As a more-or-less typical father, I decided to pose an unresolved mathematical problem. We had talked about circle and sphere packing a few weeks earlier so I asked "What's the kissing number for spheres in the 4th dimension." With the timing of Jack Benny, he responded: "1-800-KISSING."
Much better than the right answer. You can also imagine my relief that he didn't say "1-900."