What's the most frustrating thing that's ever happened on a shoot?

What's the most frustrating thing that's ever happened on a shoot?

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One of the most frustrating things, I had to photograph a baby and I had to get a shot of the baby smiling which is hard enough in itself. And we waited and waited for the baby to perk up and finally it did, it smiled and I got the shot. But just as he smiled it also puked up over it's front. So we changed the clothes, we had one other change of clothes and we got to the same point again, and again the baby vomited all over itself. So we decided we could change, turn the top around so that the back would be on the front, this was our last chance. And just as I was about to take a shot he did it again so we didn't get the shot.