We had a situation a few weeks ago at our bookstore where I picked up the phone and the caller asked to speak to a female associate -- not a particular female, just any female.
I thought maybe the caller wanted help finding a book about, let's say a "feminine problem," so I paged a fellow manager (female) to take the call.
Turned out the caller asked pointless questions about the manager's genitalia, then called back several times and asked other women in the store similar questions.
Finally one of the women got another call right as she noticed a police car right in front of the store, so she took the cordless, hit *69 (sorry, that's the actual number to get a callback number), and gave the phone to the cops.
We didn't get any more calls from that number.