Which is more annoying?
1) When a coworker non-ironically refers to "having a case of the Mondays?"
2) When a coworker refers to Wednesday as "Hump Day?"**
** Disclaimer: This is of course a completely hypothetical question that is in no way related to the author's own workplace. She is not so stupid as to blog about work, even in the most tangential of ways. Of course, if it were to have any coincidental relationship to the author's professional arrangements, well, then you couldn't prove it, nyah-nyah.