Little Johnny's kindergarten class was on a field trip to their
local police station they saw pictures, tacked to a bulletin
board, of the 10 most wanted criminals.
One of the youngsters pointed to a picture and asked if it really
was the photo of a wanted person. "Yes," said the policeman. 
"The detectives want very badly to capture him."
Little Johnny asked, "Why didn't you keep him when you took his
picture?"