Dr. Epstein was a renowned   physician who earned his undergraduate, graduate, and medical degrees in   his home town and then left for Manhattan, where he quickly rose to the top of   his field. 
Soon he was invited to deliver a significant paper, at a   conference, coincidentally held in his home town.  He walked on stage and   placed his papers on the lectern, but they slid off onto the floor. As he bent   over  to retrieve them, at precisely the wrong instant, he   inadvertently passed gas.
 The microphone amplified his mistake   resoundingly through the room and it reverberated down the hall!   He   was quite embarrassed but somehow regained his composure just enough to   deliver his paper.  He ignored the resounding applause and raced out the   stage door, never to be seen in his home town again.
Decades   later, when his elderly mother was ill, he returned to visit her. He reserved   a hotel room under the  name of Levy and arrived under cover of   darkness. The desk clerk asked him, "Is this your first visit to  our   city, Mr. Levy?"
Dr. Epstein replied, "Well, young man, no, it   isn't. I grew up here and received my education here, but then I moved   away."
"Why haven't you visited?" asked the desk clerk.
"Actually, I did visit once, many years ago, but an embarrassing   thing happened and since then I've been too ashamed to return."  
The clerk consoled him. "Sir, while I don't have your life   experience, one thing I have learned is that often  what seems   embarrassing to me isn't even remembered by others. I bet that's true of your   incident too."
Dr. Epstein replied, "Son, I doubt that's the case   with my incident."
"Was it a long time ago?"
"Yes, many   years."
The clerk asked, "Was it before or after the Epstein   Fart?"