I’ve written about one of such trick questions - How important is money to you? Now IT managers share their favorite interview questions and the thinking behind them at computerworld.
On a related note you may find Conducting the UNIX Job Interview: IT Manager Guide with UNIX Interview Questions (IT Job Interview series) book quite useful. This book is not just useful for IT managers but you will get a list of interview questions along with sample answer. A good book for job hunters, IMHO.