A young mother paying a visit to a doctor friend and his wife 
made no attempt to restrain her five-year-old son, who was 
ransacking an adjoining room. 

But finally, an extra loud clatter of bottles did prompt her to 
say, "I hope, doctor, you don't mind Johnny being in there." 

"No," said the doctor calmly, "He'll be quiet when he gets to 
the poisons."