Reminds me of Pat McManus, giving tips on how to slow down those strong, young, fit hikers if you're unfortunate enough to get stuck with one: He suggests that you ask questions about flora and fauna, and repeat as needed:

You: "What kind of bush is that?"
Young guy or girl: "Mountain laurel."

You, a few minutes later: "What kind of bush is that?"
Young girl or guy: Still a mountain laurel."