A pharmacist walks into his shop one day to find a man leaning against the wall. 'What's wrong with him,' he whispers to his sales assistant. 'Well he came up to the counter and asked for some cough syrup,' the sales assistant replied. 'But I couldn't find the cough medicine so I gave him a whole box of laxatives.' 'You idiot,' the chemist snaps. 'You can't treat a cough with laxatives. 'Of course you can,' the assistant replied smiling. 'Look at him...he daren't move now!'