Today an old man called and asked for Frank. I told him that Frank isn't working today.
OM: But I have caller ID and no one would call me besides the library.
Me: I'm sorry, none of us at the library called you.
OM: He recites the number from his ID machine: 555-1212. Isn't that Frank's number?
Me: No, that number is not Frank's or anyone elses at this library.
OM: But who called me then?
and the circular conversation continued. . .
Only later did I realize I could have used the criss cross directory to look up 555-1212.