A pharmacist told his new assistant to be polite to every customer that came in. "If you're stuck for conversation, talk about the weather," he advised.
When the pharmacist came back from having his dinner, the assistant was sporting a lovely black eye. "So much for your advice," moaned the assistant.
"What happened?" asked the pharmacist.
"Well, this woman came in for a packet of sanitary napkins. Trying to make conversation, I said that it looked like it was going to be a dull weekend…" :)