Hey man I got a great app idea I am gonna let you in on. First, I need you to sign this NDA. I'll buy you lunch and tell you about. When this thing hits big, there could be a job in it for you. But for now, if you build the app I'll give you 5% of the company. When we sell this puppy, you're gonna be rich dude!!
Oh wait....you think that my advertising based business model is completely impossible and consider this the worst idea you have ever heard?? Well, you're clearly not very competent...:)