Over at one of my favorite websites, thedailywtf.com there is a wonderful posting about riddles during job interviews. Below is a snippet of my favorite:

During a screening interview, I was asked how I would design a bike
fit for someone visually impaired. I responded something to the effect
of, "What, like, for blind people?", and she answered yes.

I thought for a moment and then I responded, "Well.. a blind person
riding a bike doesn't sound like a very safe idea, so I would make the
bike stationary, maybe with a fan blowing in the person's face. He
probably wouldn't even know the difference."

She was speechless.

Nothing like a little humour to lighten up the day.