Some problems I've helped solve:
How do you get young people to vote?
How do you revive an old forgotten candy brand?
How do you show someone looking at your website that you can create worldwide campaigns for a global brand?
How do you convince "Invincibles" to get health insurance?
How do you make after-market saw blades interesting?
How do you get a startup national attention in one weekend without spending any money?
How do you get meat eaters to buy a meat substitute?