'I think the facts do call for an explanation,'  
Someone needs to explain these facts, I think.
No one needs to explain any of these facts.
The man is ballet dancing
The witches had to move the clothes the women were wearing in order to be able to pain their skin.
Sensitive data is still protected and thus the requirements cannot be disclosed.
A white subway train has a man inside.
There is a person sky diving.
People are standing on the sidewalk.