as you shoot weddings, I mean you DO shoot lots of weddings, will know that sh1t DO happen, no one can guarantee anything, except GOD.
Sometime it is your fault, sometime is other people fault, some, we call it very "si peh suay", lawyers call it "act of God".
Professionals will do as much as he/she can to prevent any mishaps, but also there are some thing is really beyond their control, and of course, they will try their best to rectify or savage the disaster.... to a certain limit.
If anyone would take notice in this thread and another thread, you will notice somebodies don't point fingers at the photographer who lost his camera bag and the CF cards, or not even post comments in the thread, why is it so? refer to my 1st paragraph.