Tell me about the future?

It's open ended, can be interpreted as Tell me about your future, your hopes and dreams and plans and fears, etc.

Plus you never know when you're talking to a time traveler ;-)

Also, when talking to customer support and they ask at the end if there's anything else they can help me with, Can you tell me next week's winning lottery numbers?

I found it useful to keep a notebook of ideas that I add to as they come along. No idea is too trivial or too stupid to go into it - they might be the tip of the iceberg of a good idea, especially if a theme keeps recurring. I now have 80+ ideas, ranging from simple programming exercises to fully fledged projects.

Do this, and then pick one and implement it in a few languages.