My son had gotten one of those kits where you can excavate for hidden things in a block of plaster. This particular block of plaster contained shark teeth. Three of them. He laid everything out on the kitchen table and began digging. Soon he was covered in fine powder.
"Uh, Bubba," I said. "Perhaps this idea is not so good, since you're wearing a cast, which is now completely filthy."
Bubba looked at his arm. Then he looked at me. "Mama, can you help?"
I knew I'd get suckered into this. I took the excavating tools and began scraping. And scraping. And scraping. Forty-five minutes later, there was a hole all the way through the block of plaster, but no shark teeth.
"Mama," my son said. "I think they did this just to stress you out."
I scowled and scraped some more. Soon the whole thing was a pulverized pile of plaster powder. Except for five small clumps.
"Did they forget to put the teeth in?" Bubba asked.
I shrugged and picked up one of the clumps. I scraped it gently, and discovered something. A tooth? I scraped a little more. Sure enough, it was a tiger shark tooth.
"Great, Mama! Only two more to find!"
I picked up another small clump. I scraped away on that one. And yes - discovered another tooth.
I was on a roll. Next clump. I scraped that one and found nothing.
Then I tried another. No deal.
Last clump. I scraped, and scraped. And there it was. The last tooth!
I cleaned it off and handed it to Bubba. "Dude, that's the last Dr. Cool kit I'm doing! Next time you want a shark tooth, we're going to a beach in South Carolina to find one!"