Unity Developers Question:

Everyone has a pet project they would want to make if they had the chance -- it's just inherent in the game developer psyche. This is your chance to expound on it, and the more realized your idea is, the more it will be seen as proof that you know what you're doing.

Taking an existing idea and adding, "but I'd make it cooler!" isn't the answer (the number of times I've heard Q/A staff wanting to become developers tell me they want to remake Counter Strike "but better" is staggering); it just shows you have enthusiasm, but no original ideas.

Bonus points if you can take an existing IP license and make a compelling argument for a game out of it. People who can actually do that are at a premium in our industry since most tie-ins, well, suck.