Woman 1: "What are those?"
Woman 2: "Special glasses so I can view today's solar eclipse without losing my retinas."
Woman 1: "What's a solar eclipse?"
Woman 2: "When the moon passes between the earth and the sun blocking out the light."
Woman 1: "Really? Today? That will be good, it's been hot lately and we could do with the rain."

Heard on a train outside London Bridge station, Southeast London, UK.