Why you should not filled soft drinks in your vacuum flask

"Anyway, I felt kind of thirsty when Natalie Portman and gang started talking dirty, and thus reached for my coke-filled vacuum flask. I knew something was wrong when the screw-on cap refused to budge when I tried turning it. I suddenly recall studying something about the dangers of built-up gas pressure, but the temptation of savoring chilled cola down my throat was too great. So I tried again, mustering all the might in my imposing 1.6m, 45kg frame this time just to make the damn thing budge."

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