Cheers for the offerings guys. I rather like the one about the Captain, and the dress. No one I have tested it on has come back with the appropiate answer. Until I knew the "right" answer I was always thinking of answering it with tact, along the lines of "Sorry, I'm tired."
Of course, if someone did answer with "Buy her a drink" I expect the interviewers would invariably turn round and say "oh, sorry I forgot to mention that the Captain's a man" to see your reactions?
ojs, thanks for the advice about the book. I have already swiped it off a friend that had a copy, and read it quite thoroughly.
Anyone else that has an interview coming up, this book is a god send. It helps with any stage of applying, including your CV, and is "Great answers to tough interview questions" by Martin Yate. Although I would hate to be on the receiving end of one of the 'stress' interviews that they detail may happen!