Although you've spent hours strolling through London's National Gallery, you're not ready for the inspiration to end. You head to the gift shop. As you spin the postcard display near the windows, you see it's raining. It's not really a surprise (it is London in January), but you're still taken aback. You left your umbrella at home.
Just then, you spy a canister of umbrellas, including some inspired by your favorite Monet painting, "Woman with a Parasol." You rush over and deploy one of the umbrellas. The shop goes quiet. You wonder, "Is opening an umbrella inside bad luck?" Superstition says it is. But why?