Yesterday's math lesson

Neglecting to check the weather forecast in the summer because I knew it would be hot
+ Jinxed to break umbrellas in a short time (usually still usable afterward)
+ Leaving the umbrella out of my briefcase for that reason this time
+ Thin white polyester/cotton
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Honorable Mention, Wet Dress Shirt Contest

Good thing no neighbors saw me during the second leg of my walk home.