I have done some acting over the years on stage, some TV and as an extra in one movie. I remember one time I had 27 seconds to change from a union suit to full tuxedo during a live play. Since time was limited, I had to change right off the stage. I had to practice that and time myself to get it down right. On opening night, the place was packed,a full house. I did my change, walked out in front of the audience and felt a slight breeze. I casually looked down and saw my zipper wasn't done.
Figuring the scene had only been on for 5 or 6 seconds at this point, I had to cross the stage and have my back to the audience. I took that moment to nonchalantly zip it up, figuring no one would notice. The second I did it the house broke up with laughter. They had noticed. Once the sceene was over the director came over to me and I thought for certain I would catch and earful but he said it was classic and wanted me to do for the rest of the run.