like this american idol guy, Constantine.
he fell trying to do a move or something on camera, and he sat on the floor pretending that that was supposed to happen
Well, at times people can be so adorable when the have miscalculations but it is not proper to laugh at an injured or embarrassed creature for it can happen to anyone. I do not laugh when someone falls. I might laugh at videos of people doing silly things and falling about but only because I know that they would not usually put it out for others to see if they did not want some mirth associated with it.