As Google turns 10 years old, Google wants to give away a sum of $10M for the best 5 ideas that can rock the world. You can submit your idea online with an optional 30 sec YouTube video.
What's the catch? Google puts it in fine print: "you grant Google, its subsidiaries, agents and partner companies, a perpetual, irrevocable, worldwide, royalty-free, and non-exclusive license to use, reproduce, adapt, modify, publish, distribute, publicly perform, create a derivative work from, and publicly display your submission and the proposal provided therein". Basically, your idea becomes Google's.