A 4 year old sitting in the subway train near his grandmother. She looks at him and suddenly notices a scratch:

Grandmother: Oh, you have a scratch on your cheek. How did you get that?
Boy: Where? Here? I..have a wound!
G: That is a scratch. How did you get that (she spoke very calmly and with warmth all the time)?
B: I don’t know…
G: Did someone scratch you? Did you fight with other children?
B: I don’t really know..
G: How can you not know how you got scratched? This happened today…
B:…
G: Did you do it to yourself? By mistake?
B. Yeah, I think I did it by mistake…I think I fought with another boy by mistake…And when he tried to hit me…I was also trying to hit him…aaand, he scratched me with his hand… By mistake!