The proprietor of a small village drugstore was called out one sleepy summer morning, leaving the establishment temporarily under the sole management of a very young, and very uneducated, clerk.
"Just answer the phone if it rings, Jim," instructed the proprietor.
The phone rang.
"Hello," said the clerk.
"Do you have streptomycin and aureomycin?" asked a voice at the other end.
The clerk scratched his head, then said, "Ma'am, when I said 'Hello' I told you everything I know!"