Little Johnny and his dad went…

Little Johnny and his dad went upstairs one day to hang a picture and frame while mom made lunch. About twenty minutes after they went upstairs Little Johnny came downstairs crying.
“What’s wrong?” His mother said.
“Daddy slipped and hit his thumb with the hammer!” said Little Johnny.
“Well…” Little Johnny’s mother said, “That’s nothing to cry about, daddy will be okay. It’s actually kind of funny, I don’t know why you didn’t laugh when it happened.”
“I did!” Little Johnny said.