Not quite an analogy...

Jake was talking to me about the soda geysers that you can do with Coke and Mentos. He wanted to try it with Bottle Caps and Mt. Dew. I told him that I didn't think he'd get the same results. He was a little disappointed that I wouldn't let him try it anyway. As he left the room he said, "I'm like a Mentos." "Oh? How do you figure?" I asked. "I'm a little bit hard on the outside, and all soft and sensitive on the inside..."  Hmmm, I thought he meant he was chewy with a thin candy shell.