As you trudge along the sidewalk, water dripping down your face, you suddenly hear the sound of a car approaching. Panic sets in as you realize you're about to get splashed. And sure enough, as the vehicle drives past you, a wave of water splashes over your clothes and saturates you. The last thing you see before you're completely drenched is your nemesis standing on the other side of the street, under a covered walkway, grinning from ear to ear with an umbrella in hand.