When you dump a massive cup of coffee in your lap in class while you're sitting in the front row and spend the next hour trying to dry yourself discreetly while trying not to distract the professor, reeking of denim latté, then sneaking out at the end of class strategically holding a rucksack to hide the embarrassingly large wet spot between your legs and forgetting your digital recorder on the speaker's stand...
That's how you know...