I once had a Saturday job in a chemist. One day a young man came in and asked for a packet of 3, well, whispered it actually and so I told him to repeat it, which he did. My reply was 'packet of 3 what?' in my normal voice to which this man blushed and after repeating his request and receiving a polite but blank expression asked to speak to the manager, who was also the pharmacist at the back. I called the manager [male] over and said again in my normal voice 'this gentleman would like a packet of 3 but I don't know what it is or where to find it'. The manager gently said he would take over!!!! Afterwards he kindly explained what they were and where I could find them in the future. So I learned something that Saturday! I was 15.