(The following is made up and CERTAINLY isn't for the job I currently have open for a senior PHP dev in Melbourne.AU)

Here's why you don't see question one answered honestly:

A. Our sales guys sold our product based on feature "Foo" a year ago. We haven't started coding but they need a demo next week. You have to grok our codebase and write it on your first day.

B. The 'Bar' feature was written by a guy who should have failed finger painting, but we don't have time to rewrite it. You have to fix the many patches and modifications it's had since.

C. The 'Zap' feature was written by our cowboy programmer. You have to do all his bug fixes and modifications because he thinks he's too important for anything but new code.