Under what interesting circumstances in the past have you learned that your fly was open?

Question

Under what interesting circumstances in the past have you learned that your fly was open?

Answer 1

Performing on stage with my band at a show---in front of at least 100 people....

Answer 2

On my first day at a new job...after my boss walked me around the whole 4 story real estate building I work in and introduced me to everyone, including the big wigs of the company. how embarassing. and no one told me! lol too funny now.