Leaving the Aquarium

A friend gave a talk in church yesterday. He started by saying that his wife wanted to go to the aquarium for her birthday, so they did.

When they left the aquarium, she directed them onto the highway and toward home. Fifteen minutes later, they were back at the aquarium. She had directed him in a circle.

My friend asked his wife, "How can you be so beautiful, but so dense?"

She said, "I'm beautiful, so that you will be attracted to me. I'm dense, so that I will be attracted to you.