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When you:

1. are being visited by someone you don't expect;
2. and he's sick and needs ur attention;
3. and u have 3 presentations;
4. without knowing any of them in depth;
5. and u have already spent 9 hours at the library;
6. and u are tired as hell;
7. you think you need to relax;
8. and try to joke with your significant other;
9. but he refuse to do so;

then u r doomed.