Yes did ,experience such an embarrasing lecture, when i was invited to one of this polytechnic in the west for a lecture,have a number of student listening to me, i heard a querrl with a friend that morning before going to the lecture i forgot that i suppose to switch off my cell phones because i may have an emergency calls because the issue, to my surprise he called at the middle of the lecture and the phone went automatically into loudspeaker and he said you are the most terrible person i have ever met,my stuudent started laughing!!!!!!!!!!!!!!!!

wht a bad day,