I had an interviewer ask me "how do you copy a file in Unix". Which was a good intro to the rest of the interview... Which was, "let's brainstorm together other ways to copy files around until we run off the end of what you know". Was a fun one.

It was too long ago to remember details, but I suppose the interview got as far as "the data link supports 16kbps, the far side doesn't have compression software, but you have to move 10e6 zeros in less than 30 seconds, how?"