kidding
Everything works fine. The location is well prepared, you model as well. Make up done, the story in place. Everyone on stage knows what to do. The light ist 100%, all batteries at 100%, camera and lenses fine. The first shots shows, you are in line, on track, all systems are go
A quick view on the back LCD confirms your feeling. Wunderbar… it is flowing. That is what you want. So you go on. But suddenly it happens. You do not know when or why, you do not have even an idea what the initial thing was but the complete situation turns in a second into complete laughter and your model is doing funny things …
You can be angry now, go for a break or just accept what you get and shoot on, laughing too without knowing why. I prefer the last ! Because the job is fun !