['One the way to work, I got a flat tire and I missed a very important presentation.  I was pretty upset.', 'Oh, man!  That is a nightmare!  Was your boss upset with you?', 'No, he understood, but I missed a really good presentation.  I was not happy.']
Yeah, it happens to the best of us.  You just have to try and forget about it and move forward.
One the way to work last week, my car got a flat tire and I was late to work.  I was supposed to give a presentation that day and someone had to take over for me.