An exerpt from a real conversation I just had with my 19 month old:
Me: "Give me a kiss."
Him: "No."
Me: "Yes."
Him: "No."
Me: "Yes."
Him: "No."
Me: "No."
Him: "Yes."
Me: "No."
Him: "Yes."
The moral of this story: He is very independent and is great at debating alternate viewpoints.