At the doctors

A young mother was having a consultation with a doctor.

As they spoke, her Little Johnny would clearly be heard terrorising the people in the waiting room-yet she made no attempt to restrain him. Soon they heard some clattering in an adjoining room but still she did nothing.

Finally, after an extra-loud crash, the woman casually told the doctor "I hope you don't mind my little Johnny playing in there".

"No, not at all" said the doctor calmly. "I'm sure he'll calm down

Spoiler:

as soon as he finds the poison".