If you’re an umbrella user, you’ve probably been hit with this dilemma: sure, it’s sunny outside now, but will it still be sunny ten hours from now when you’re standing at a bus stop, trying to get home from work? If you take the umbrella and it turns into a 90°F sunny day, you look like a fool. If you leave the umbrella at it turns into a rain-drenched 65°F day, you look like a very damp fool.

