Doing this always reminds me of the hideous story one of my old bosses told me. A guy was being interviewed by her for a job and it was all going well, until at some deranged point, he said casually "So when are you leaving then?". Old boss looked puzzled. "Er, well you'll be off work soon, won't you?" "Not as far as I know" said old boss. Now at this point the guy should have laid down his shovel and stepped away from the massive hole he was digging. "Well you must be on maternity leave soon". "Er, no". Surprisingly, he never got the job.