Based on a Few of the Responses I've Received, I'm Guessing It's Friday the Thirteenth

A follow-up to the two posts immediately preceding this one:

"And They Think I'M Nasty?"

"Wanna Write? 'Abandon Hope, All Ye Who Enter Here!'"

"Never make people laugh," Senator Thomas Corwin (d. 1865) is reported to have advised a politically ambitious young man.  "If you would succeed in life, you must be solemn, solemn as an ass. All great monuments are built over the tombs of solemn asses."