For a 20th anniversary, a husband and his wife vacationed in Hawaii, where they went snorkeling. After an hour in the water, everyone got back on the boat, except for the wife and one handsome young man.
As she continued her underwater exploring, she noticed that everywhere she swam, he swam. she snorkeled for another 40 minutes. So did he. She felt very flattered and, as she took off her fins, asked him coyly why he had stayed in the water for so long.

"I'm the lifeguard," he replied matter-of-factly. "I couldn't get out until you did."